Database Develop

[Q] Problem booting into Recovery

So.... Been playing with this for the last two days trying to root this phone.
I've rooted a few other phones, so I do have experience with the overall process, but I am unable to even boot this phone into Recovery. I have tried booting into recovery by holding down both volume buttons + power and from adb terminal "adb reboot recovery."
Neither method works. The phone will boot (or reboot from adb) and brings up the "at&t World Phone" screen and then nothing else appears. The first time I tried this it actually wouldn't boot up even after pulling the battery and trying to start normally, it still sat at the same screen. I let it sit all day today at the screen until the battery died. I was finally able to get it to boot up earlier.
If anyone can help, that'd be greatly appreciated. Let me know what info I need to add.

I usually just press and hold both volume buttons and power then release just the power button and keeping the volume buttons still pushed on the 2nd time the white at&t screen pops up... Works for me every time.
Sent from my SAMSUNG-SGH-I897 using XDA App

hold volume up+down and power key btw this is wrong section to post supposed to be in general

Oh sorry, didn't realize it was supposed to be posted in general.
I've tried the Volume Up/Down + Power and this does not work, as I stated originally.
I've also tried to do it from the adb shell, which also does not work.
Does anyone have any idea why I can't access recovery?

I"m having a similar issue. Holding volume up+down and power and releasing in any combination just boots the phone up. If I just hold volume up+down and power the phone alternates between the AT&T World Phone screen endless.

Yes u have to let go of the pwr button when the phone screen turns on
Sent from my SAMSUNG-SGH-I897 using XDA App

I've tried just about every combination of the Volume Up/Down + Power and no luck.
I've also tried the following ADB commands, with no luck, it just reboots the phone:
adb reboot recovery
adb reboot-boatloader
When I hold Volume Down + Power I get the a Yellow Triangle with a Android guy with a shove with the text "Downloading... Do not turn off Target!!!"
When I hold Volume Up + Power I get an Android guy with the following text: "POWER RESET or UNKNOWN UPLOAD MODE"
For kicks, I tried to to flash a rooted update.zip via the Volume Down + Power way with the Samsung update software, the same way I have done with the Samsung Moment. Wasn't sure if it'd work, but worth a try.
Any one else have any ideas or suggestions?
Phishie, do you have a final release version? Or anything special about the phone you have?

I just press the two volume buttons first (to make sure theyre pressed before you hit power), then press the power button, as soon as the screen turns on, I let go of everything and it works just fine, no need to have ridiculously complicated instructions.
The trick is to make sure both volume buttons are pressed BEFORE you hit power. Then release. Easy as pie

Also, if you guys are having too much trouble, just download the one click root/unroot. It will run, boot your phone into recovery, then all you have to do is scroll to install packages with volume key and hit power. Done.

Trust me, I am making sure I'm pretty the keys completely. I've literally tried it fifty times by now.
And I've also tried the One Click Root. This does not boot the phone into recovery either. It just sits at the AT&T World Phone screen forever and will actually get stuck here and will not boot up normal even by pulling the battery and powering it back up. It'll just get stuck at the for-mentioned screen. I have to connect it to adb and reboot it there to get it out of the loop it's stuck in.

that doesnt sound good. Maybe you need to try a factory reset? are you running stock rom and everything?

When I first got the phone I did a factory reset.
Yea, it's completely stock to my knowledge. But I have a different ROM than the final release version that everyone else has. This is a pre-production device.

same problem
I try all the combos as well, no luck, would the combos be different for 2e vs 3e recovery?
I try combo, it powers on, the same thing happens, the at-t comes up, goes for a second, then screen brightens, wait a bit and then the home row buttons light up, hangs there... doesnt matter which kernel or which rom I flash, same thing, adb and other stuff wont work as they need usb debugging enabled, which mine isn't.
Is there a way to mod the phone files and flash to enable usb debugging? Anyway to remap the buttons to 2 button vs 3 button?
Everyone post your methods for entering recovery please?

[Q] Any chance of recovery from bricked state?

I was upgrading to Cog 9.1 using 2e recovery and I think my captivate is now bricked. It does not display anything (only black screen). Even after connecting to USB I do not see the battery charging symbol. Is there anyway out of this mode?
I have tried all the different key combos to try to get into download mode. I could always get into download mode earlier using down button + power button combo.
Any pointer will be very helpful.

How did you flash, and when did you realize there was an issue
Captivate
Cog 2.2

I flashed using ROM manager and I realised the issue after the screen remained black for around 30 mins.

sag.misc said:
I was upgrading to Cog 9.1 using 2e recovery and I think my captivate is now bricked. It does not display anything (only black screen). Even after connecting to USB I do not see the battery charging symbol. Is there anyway out of this mode?
I have tried all the different key combos to try to get into download mode. I could always get into download mode earlier using down button + power button combo.
Any pointer will be very helpful.
Click to expand...
Click to collapse
the volume buttons and power combo are used to put it in recovery. Mine got stuck on the at&t logo. I pulled the battery after about 40 minutes, turned it on into recovery, wiped my data, rebooted, then worked flawlessly. My advice -> pull battery, put it back in, hold volume buttons, then connect the usb while continuing to hold up/down volume buttons, this should get you into download mode.

sag.misc said:
I could always get into download mode earlier using down button + power button combo.
Any pointer will be very helpful.
Click to expand...
Click to collapse
This sounds like i9000 rom button combo. Won't work with COG. For recovery hold both volume buttons and hold power button in. When at&t logo shows up, wait about a second and release the power button but continue to hold the vol. buttons. Should get you there.
For download, hold volume buttons down and plug in usb. Should put ya right there.
If you have a cappy that has the no buttons bug, you're pretty much hosed.
Designgears has a thread in the development section about the 3 button issue, with a mod that fixes it. Give it a read.
If you had usb debugging enabled and the computer sees the phone, you should be able to use adb to reboot recovery or download too.

[Q] No really, I bricked it...

OK, I've been reading here for 6 days all manner of Captivate unbricking. Here is my story...
I picked up a Captivate on the Rogers network. I connected it to my email server (Exchange 2010) with no problems, poked around, noticed the lag, noticed the SMS time issue, then promptly rooted, installed clockwork, and then threw cognition 2.2 beta 9.1.3. Quite frankly I was shocked at how much faster it was.
Anyways, after a day of poking around, I could not get my email to my exchange server running (tried the email.pak floating about), so I actually decided I was going to go back to the backup I made of my phone using clockwork before I installed cognition. When I restored my backup, I thought I had bricked my phone.
I let it rest for a day, then came back here, and found one of the 3-4 different variations of the 4 button download mode combo that permitted me to do the 1 click restore. This restored me to the AT&T version of 2.1. It worked, but was less than desirable.
I decided that at that point I really wanted to go back to stock, so I downloaded the stock backup on the Rogers Captivate wiki page, and did the restore using clockwork. The phone has not been the same since.
When i turn it on, I get an at&t splash screen, then in about 20 seconds I get the at&t "jingle", but the splash screen stays on. I can't seem to find any key combination that will permit me to get back into download mode so I can restore using the One Click that worked for me the first time. I have tried:
1. 3 button salute with USB in first, battery out initially.
2. 3 button salute with USB plugged in *as* I was inserting the battery.
3. Power and volume down (both with and without USB, and with battery being plugged in after USB and "during" insertion of battery)
4.Power and volume up with same combo's as #3.
5. Just volume up and volume down with same combo's as #3.
In all cases Odin was running before USB connected, running as administrator. I'm running 64bit windows, but I'm sure I have the correct drivers because I did this the first time with Odin and download mode and I haven't added or changed anything. But just for arguements sake I did uninstall, and then install the drivers again.
Any combination of power and volume buttons just gives me a battery charging logo. Occasionally when holding up until the second black screen I will get a quick indication that the computer might see something, but it dissappears withing a handful of seconds showing it promptly removed.
I'm downloading the Android SDK in the hopes that when I get the normal at&t splash screen after the "jingle" that something might actually be running in the background and maybe I can adb reboot download it but I'm not holding my breath.
Anyone seen this that has managed to get out of it? I'm starting to think the "unbrickable captivate" can be bricked. Assuming it is bricked, short of taking it back, is there anyone on the internet that can jtag these and in some fashion bring back to life?
Cheers,
Tim

This doesn't belong in Development.

MikeyMike01 said:
This doesn't belong in Development.
Click to expand...
Click to collapse
ditto
and download mode is easy.
1. start odin3 and have data cable plugged into the computer
2. insert proper files if needed
3. hold volume up and volume down for 2 sec (no power button needed) then insert usb cable, continue to hold volumes till either the download mode screen pops up or odin3 sees the phone(if you bork the phone bad enough you can corrupt the download mode image, i did it with the not to successfull manhatten project kernel) but despite the screen being black it very well may be in download mode.
4. start flash
5. if it doesn't work send it to me ill find a use for it
alternatively if the phone can go passed the splash screens and boots fully you can adb reboot download. just get the development kit and drivers on your pc.

Dani897 said:
ditto
and download mode is easy.
1. start odin3 and have data cable plugged into the computer
2. insert proper files if needed
3. hold volume up and volume down for 2 sec (no power button needed) then insert usb cable, continue to hold volumes till either the download mode screen pops up or odin3 sees the phone(if you bork the phone bad enough you can corrupt the download mode image, i did it with the not to successfull manhatten project kernel) but despite the screen being black it very well may be in download mode.
4. start flash
5. if it doesn't work send it to me ill find a use for it
alternatively if the phone can go passed the splash screens and boots fully you can adb reboot download. just get the development kit and drivers on your pc.
Click to expand...
Click to collapse
Thanks, but that doesn't work. All I get is the battery charging screen. Using the process it does not go into download mode.

MikeyMike01 said:
This doesn't belong in Development.
Click to expand...
Click to collapse
Could a moderator move this to Captivate General then? Sorry about that...

timmy22 said:
Thanks, but that doesn't work. All I get is the battery charging screen. Using the process it does not go into download mode.
Click to expand...
Click to collapse
just to be clear, you are holding volume up as well as volume down starting with the phone being powered down and continue to hold them after you plug in usb untill something shows on the screen?
if your phone is not seeing the volumes buttons you are one of the very unlucky few that had a problem at the most inopportune moment.
there is also a way where you hold all three buttons till the phone reboots twice, or something. let me try it and ill give more specifics.

timmy22 said:
Thanks, but that doesn't work. All I get is the battery charging screen. Using the process it does not go into download mode.
Click to expand...
Click to collapse
Pull the battery, open odin, plug usb into computer, hold vol up and down, plug usb into phone still holding vol buttons, drop in battery still holding vol buttons, when dl screen pops up and yellow com port lights up in odin release volume buttons. Do not touch power button at any time
Swyped...and sorry I don't proofread

Have you tried rebooting into recovery mode instead of download mode? Stock recovery is adb-ready and you should be able to adb reboot download. Its a long shot if you're having problems using button combo to get to d/l mode, but it's probably still worth a shot at this point.
If you were able to use 3 button combos before all this happened, and did NOT have to install the 3 button combo fix, its strange you don't have access to it now... Could restoring a Rogers Cappy to AT&T stock be the problem?

Dani897 said:
just to be clear, you are holding volume up as well as volume down starting with the phone being powered down and continue to hold them untill something shows on the screen?
if your phone is not seeing the volumes buttons you are one of the very unlucky few that had a problem at the most inopportune moment.
there is also a way where you hold all three buttons till the phone reboots twice, or something. let me try it and ill give more specifics.
Click to expand...
Click to collapse
Yes, that's exactly correct. I do this:
1. everything pulled (battery, USB, sim, sd)
2. Open Oden (1 click)
3. Install battery
4. hold down (and keep holding) volume up and volume down
5. insert USB cable
6. depress (i.e. don't hold) power button
Goes straight to battery charging indicator.
If I swap #6 with holding the power button down, it continually reboots while just barely showing the battery charging indicator. I've tried letting go between black screens on the 1st, 2nd, 3rd, 4th, and 5th black screen. Still no android dude with the shovel.

Try all the steps you stated but not the last one where you press the power button. Don't press the power button.

newter55 said:
Pull the battery, open odin, plug usb into computer, hold vol up and down, plug usb into phone still holding vol buttons, drop in battery still holding vol buttons, when dl screen pops up and yellow com port lights up in odin release volume buttons. Do not touch power button at any time
Swyped...and sorry I don't proofread
Click to expand...
Click to collapse
Goes straight to battery charging.

johnny13oi said:
Try all the steps you stated but not the last one where you press the power button. Don't press the power button.
Click to expand...
Click to collapse
Goes straight to battery charging.

Pull out battery for 10 seconds, hold volume up + down, connect usb into other usb port.
Sent from my GT-I9000 using XDA App

Seriously, try adb. It works wonders.
Sent from my SAMSUNG-SGH-I897 using XDA App

10tonhammr said:
Have you tried rebooting into recovery mode instead of download mode? Stock recovery is adb-ready and you should be able to adb reboot download. Its a long shot if you're having problems using button combo to get to d/l mode, but it's probably still worth a shot at this point.
If you were able to use 3 button combos before all this happened, and did NOT have to install the 3 button combo fix, its strange you don't have access to it now... Could restoring a Rogers Cappy to AT&T stock be the problem?
Click to expand...
Click to collapse
Trying to get into recovery mode gets me the at&t logo and the "jingle", but no recovery mode menu to reboot, etc.
This is what I'm worried about, restoring the Rogers stock over top of the Odin 1 click restore (which is an AT&T image) has bricked it and prevents download mode from invoking.

fatttire said:
Seriously, try adb. It works wonders.
Sent from my SAMSUNG-SGH-I897 using XDA App
Click to expand...
Click to collapse
I know, I played with adb before I bricked it. ADB needs to "see" the phone, it no longer sees it (I have three computers, all three can't see it, but they can see my friends cappy with no problems first time, every time). Same process for his phone works every time to get into download mode, but not on mine.
And yes, have tried other USB ports on the same computer, both on the mainboard, and on the front ports.
Keep the ideas coming though please, I will try every one.

timmy22 said:
I know, I played with adb before I bricked it. ADB needs to "see" the phone, it no longer sees it (I have three computers, all three can't see it, but they can see my friends cappy with no problems first time, every time). Same process for his phone works every time to get into download mode, but not on mine.
And yes, have tried other USB ports on the same computer, both on the mainboard, and on the front ports.
Keep the ideas coming though please, I will try every one.
Click to expand...
Click to collapse
There's a trick to prompt download mode through a "jig" which you can hack together for about $2 in parts and a sacrificial microUSB cable...it works on the other SGSes, but I think it should work on the Captivate as well. Never tried it personally...

Merlin_reloaded said:
There's a trick to prompt download mode through a "jig" which you can hack together for about $2 in parts and a sacrificial microUSB cable...it works on the other SGSes, but I think it should work on the Captivate as well. Never tried it personally...
Click to expand...
Click to collapse
I work in a tech shop so have access to electronics, sacrificial cables, soldering irons, resistors, caps, etc.... could you point me in the right direction?

Oh, nevermind, found it in the i9000 forum. Will test first thing in the morning!
Cheers,

I bricked one today as well. Exactly what you are talking about here. The only thing is that i was still under the 30days so i swapped it out for a new one. As of right now ive been debating whether i want to do the voodoo fix (which i think is what bricked it to begin with)

CLOSED - Got a new phone :(

Got a new phone

This isn't really great advice, but, if the bootloader is toast, there is a good chance you can get it fixed under warranty as Samsung won't be able to tell what you had on it.
You could try making the jig as the parts are cheap, but not much chance if your cappy is unresponsive.
There is also the aftermarket jtag option. It's expensive, but should work. You may be able to find someone with it. Seeing as your reward offer is half the price of one, it probably wouldn't be out of line as far as somebody offering that service.

I am assuming you have already done this and just forgot to mention it but try pulling sd card and sim for a few. Pulling only the battery does not always work for me
Sent from my SAMSUNG-SGH-I897 using XDA App

did you get any error from ODIN while flashing? especially about sbl.bin?

Im having the same problem... totally black screen, no power...i have flashed million roms also and have always been able to restore from a soft brick..but this time it wont even boot to get into download mode..ive tried every single method to get into download mode with no luck..
att is going to send me a warrenty replacement so ..hopefully that goes well.. but ill continue messing with it and if i get a fix ill def post it for ya

open Odin,,remove battery ,wait 1 minute, put battery back in, press and hold both volume buttons, insert usb. Hope that helps. this is what i did when I black screened mine.

Where are you located?
There was one time I really screwed the pooch with Odin and my phone ended up with a black screen & unresponsive. The JIG did manage to pull me out of it, I'm very certain the "your mileage may vary" line is applicable here.

I heard that even if the screen is black if you see it in odin you can use it. I would use odin one click. Good luck.

Try this. Unplug and remove battery. Plug in the usb open odin3 jh6 one click downloader. Press and hold volume up/down and power. Insert battery and release only the power button at the same time and keep holding volume up/down buttons. Let drivers insall if they aren't on your computer. Press download.
Sent from my GT-I9000M using XDA App

goob1284 said:
Try this. Unplug and remove battery. Plug in the usb open odin3 jh6 one click downloader. Press and hold volume up/down and power. Insert battery and release only the power button at the same time and keep holding volume up/down buttons. Let drivers insall if they aren't on your computer. Press download.
Sent from my GT-I9000M using XDA App
Click to expand...
Click to collapse
Sorry I feel stupid. Dodnt read the 2nd thing. This should work. Is your battery fully charged? And try adb if your computer can see it at all. And use clockwordmod next time so much easier and safer. But if everything fails att covers our.phone for a year. I know cause I bricked.it and tried exchanging it.
Sent from my GT-I9000M using XDA App

Me too have same problem and I offer another 75 US$ for how can help me solve it, I try all the above combination and JIG also but nothing works .

Try:
Connect USB to PC
Open odin one click
press and hold volume down (not up)
Insert USB to phone
or
Connect USB to PC
Open odin one click
press and hold volume down (not up) + hold power
Insert USB to phone

From thekurrgan
Situations: phone-!-Computer / no download mode
Black Screen / RST_STATUS 0x0
Procedure:
1. Remove the battery, external SD card and SIM card.
2. Wait 10 seconds.
3. Open odin3
4. Connect usb cable.
5. Hold volume up + volume down + Power.
6. Insert battery.
7. Release POWER BUTTON ONLY.
You should now be in immediate download mode.

jhnstn00 said:
From thekurrgan
Situations: phone-!-Computer / no download mode
Black Screen / RST_STATUS 0x0
Procedure:
1. Remove the battery, external SD card and SIM card.
2. Wait 10 seconds.
3. Open odin3
4. Connect usb cable.
5. Hold volume up + volume down + Power.
6. Insert battery.
7. Release POWER BUTTON ONLY.
You should now be in immediate download mode.
Click to expand...
Click to collapse
Exactly what I said? He said it didn't work
Sent from my GT-I9000M using XDA App

http://db.tt/ugaNHRz
if you have not tried adb try this. Unzip to computer.
Run the script for reboot download.
Axura CE RC2.1 w/ excalibur 2.1.6, ugjk4 modem, Voodoo, BlackFroyo theme

jhnstn00 said:
http://db.tt/ugaNHRz
if you have not tried adb try this. Unzip to computer.
Run the script for reboot download.
Axura CE RC2.1 w/ excalibur 2.1.6, ugjk4 modem, Voodoo, BlackFroyo theme
Click to expand...
Click to collapse
I tried ADB. I am going to try a JIG today.

kennethpenn said:
I've flashed ROMs a hundred and a half times and been fine. Gotten myself out of a million soft-bricks. But, this time I think I'm screwed.
My screen and phone is totally powered-off black after I tried to flash I9000UGJK4.tar as PDA in Odin on my device.
I've tried:
1.) Holding vol buttons and plugging in USB
2.) Taking out battery, plugging in, holding volume buttons and power button, putting battery in while letting go of power button.
Nothing responds. Is the JIG going to work in this situation or is this a hard-brick? I read the JIG thread and he said if your screen is black it won't work so I'm just wondering.
Paypal - $75 to anyone who can make my phone work.
Click to expand...
Click to collapse
We need more info , is your pc detecting anything at all when connecting phone ?
like a sound or some unknown drivers ?
Plug the charger in the phone is something displayed ( like charging image)
hzeid said:
Me too have same problem and I offer another 75 US$ for how can help me solve it, I try all the above combination and JIG also but nothing works .
Click to expand...
Click to collapse
same questions as above .
jhnstn00 said:
From thekurrgan
Situations: phone-!-Computer / no download mode
Black Screen / RST_STATUS 0x0
Procedure:
1. Remove the battery, external SD card and SIM card.
2. Wait 10 seconds.
3. Open odin3
4. Connect usb cable.
5. Hold volume up + volume down + Power.
6. Insert battery.
7. Release POWER BUTTON ONLY.
You should now be in immediate download mode.
Click to expand...
Click to collapse
even tho you see nothing in the screen try to start Odin anyays see if it does something ..
jhnstn00 said:
http://db.tt/ugaNHRz
if you have not tried adb try this. Unzip to computer.
Run the script for reboot download.
Axura CE RC2.1 w/ excalibur 2.1.6, ugjk4 modem, Voodoo, BlackFroyo theme
Click to expand...
Click to collapse
well That is one of the reason why we need to know what happens when your phone is plugged in via USB ...
Here is my advice : unless you are experienced with the Jig ( you ve restored your phone at least once using it already ) I say try again and again
For example : these resistor sometimes have 5% variation so for me the 301k wasnt working had to put it at 300 otherwise it wouldnt work ..
would also like top point out the jig does trigger soemtign in your phone so again even if nothing shows up on the screen try to flash anyways ...
BTW you shoudl remove the bounty and just offer it once you have beenhelped , I doubt anyone here is in it for the money (except me of course ) j/k

For dead screen, try this. It sounds like voodoo but it got me going.
Remove the battery.
Open Odin.
Connect via USB
Plug the battery in.
Hold down POWER and VOLUP until you get RED text on the screen. This will look bad, but is in fact a good thing. This can take 20-30 seconds.
Once the red text is up, hold down BOTH VOL buttons and POWER. Again this part will seem to take too long, but the red text will go black after a bit.
When the red text goes black, let go of POWER but continue to hold down both VOL.
Welcome to download mode.

loraque said:
For dead screen, try this. It sounds like voodoo but it got me going.
Remove the battery.
Open Odin.
Connect via USB
Plug the battery in.
Hold down POWER and VOLUP until you get RED text on the screen. This will look bad, but is in fact a good thing. This can take 20-30 seconds.
Once the red text is up, hold down BOTH VOL buttons and POWER. Again this part will seem to take too long, but the red text will go black after a bit.
When the red text goes black, let go of POWER but continue to hold down both VOL.
Welcome to download mode.
Click to expand...
Click to collapse
Exactly how I fixed mine after stock flash idin gave me purple screen
Sent from my SAMSUNG-SGH-I897 using XDA App

loraque said:
For dead screen, try this. It sounds like voodoo but it got me going.
Remove the battery.
Open Odin.
Connect via USB
Plug the battery in.
Hold down POWER and VOLUP until you get RED text on the screen. This will look bad, but is in fact a good thing. This can take 20-30 seconds.
Once the red text is up, hold down BOTH VOL buttons and POWER. Again this part will seem to take too long, but the red text will go black after a bit.
When the red text goes black, let go of POWER but continue to hold down both VOL.
Welcome to download mode.
Click to expand...
Click to collapse
Never heard of this! Please make a post of this so I can make it a favorite. Might need this in the future. Good work.
Sent from my GT-I9000M using XDA App

[SM-T510/T515] 2019 Galaxy Tab A 10.1 Hard Resets

Here's a quick reference for how to reboot and reset your 2019 Galaxy Tab A 10.1 (SM-T510/T515) using the hardware buttons:
Force restart:
- If your device is frozen and unresponsive, press and hold the Volume Down + Power keys simultaneously for more than 7 seconds to restart it.
Boot to Recovery Mode:
- Power off the device
- Press and hold the Volume Up + Power keys at the same time.
- Release both keys when you see Recovery Mode.
Boot to Download Mode:
- Disconnect the USB cable
- Power off the device
- Press and hold the Volume Down + Volume Up keys
- Insert the USB cable
Boot to Safe Mode:
- Power off the device
- Press and hold the Power key.
- When the boot logo appears, release the Power key and then press and hold the Volume Down key.
- Continue to hold the Volume Down key until the device finishes restarting.
- Safe Mode will display in the bottom left corner of the screen.
Since there is no Bixby button, these combinations are different than the Galaxy S10. If you know of additional combinations, please contribute to the discussion below and I'll consolidate here.

If there’s no response on your device or you're stuck in a boot loop, then you might need to wait for the battery to drain. The 2019 Galaxy Tab A 10.1 has a non-removable battery pack, so disconnecting that isn't an option. Hopefully, the system reverts to its normal function with a cold boot. This can take time if the battery has high charge left at time of failure. Depending on how fast your battery drains, this can mean waiting for a few hours to several days.
UPDATE: With the right timing, you can break out of a boot loop into Download Mode...but it's tricky:
Insert USB Type C cable connected to your PC
Press and hold the Power and Volume Down keys for exactly 7 seconds (hard reset)
Release the Power key and press and hold both Volume Up & Down keys (enter Download Mode)
If you don't see the blue bootloader unlock warning screen, keep repeating the above two steps
The trick here is that you're trying to time your switch to the Download Mode keys for the exact moment the hard reset takes effect. If you see the boot logo while still holding the first key combination, it's too late. If you switch too early, you won't trigger the hard reset.

I've had to hold down both volume up and volume down while plugging in usb to get the unlock screen to populate. Canadian Wifi variant.

Jambii1987 said:
I've had to hold down both volume up and volume down while plugging in usb to get the unlock screen to populate. Canadian Wifi variant.
Click to expand...
Click to collapse
Thanks, that was an error in my initial post. I was figuring these out by trial and error, but it turns out that our hard resets are basically the same as for the Galaxy M30, which also uses the Exynos 7904 SoC and has no Bixby key.
https://www.hardreset.info/devices/samsung/samsung-galaxy-m30/download-mode/
UPDATE: Also the same as for the Galaxy A30 and some others.
https://www.hardreset.info/devices/samsung/samsung-galaxy-a30/download-mode/

Jambii1987 said:
I've had to hold down both volume up and volume down while plugging in usb to get the unlock screen to populate. Canadian Wifi variant.
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Yes, I did the same way
US version
1. Enable OEM Unlock
2. Turn the tablet off and unplug the cable
3. Press and hold both volume up and volume down buttons and plug USB cable to host computer
4. You will get wipe screen. Long press volume up to unlock the bootloader.
Now I have to find matching ROM and patch the boot.img and flash.
I believe you have to disable Vault Keeper to keep root intact.

Brand new out the box 11am this morning.
Opened the parcel cool no damage. Powered up fine, had a mess with it, no problems check the speakers were fine and no issues plugged it on charge to 100% took it off and left it for an hour or so, went back to it and physically used it to use Facebook and play candy crush cool no problems. Took a few photos and no problems again. Put it on the side still on near 90% and went back to it 30 minutes later completely off and won’t turn back on, tried charging it nothing no sign of life, tried rebooting it and still nothing. Please tell me that this is not the end and I need to get a replacement... ?*

christina98 said:
Opened the parcel cool no damage. Powered up fine, had a mess with it, no problems check the speakers were fine and no issues plugged it on charge to 100% took it off and left it for an hour or so, went back to it and physically used it to use Facebook and play candy crush cool no problems. Took a few photos and no problems again. Put it on the side still on near 90% and went back to it 30 minutes later completely off and won’t turn back on, tried charging it nothing no sign of life, tried rebooting it and still nothing. Please tell me that this is not the end and I need to get a replacement... ?*
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Have you tried getting into download mode? Or recovery for that matter.

Triscuit said:
Have you tried getting into download mode? Or recovery for that matter.
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I’ve not even been able to get it back on, I’ve attemp a reboot countless of times and still nothing rectifys it. I spoke with Samsung they feel it’s a major fault with the tablet and have told me to request a replacement from my provider or even a refund.

Forgot pattern password, unable to power 510 Tab A off since pattern password is required. How to wipe tab or reset to factory without powering off?

Magendanz said:
If there’s no response on your device or you're stuck in a boot loop, then you might need to wait for the battery to drain. The 2019 Galaxy Tab A 10.1 has a non-removable battery pack, so disconnecting that isn't an option. Hopefully, the system reverts to its normal function with a cold boot. This can take time if the battery has high charge left at time of failure. Depending on how fast your battery drains, this can mean waiting for a few hours to several days.
UPDATE: With the right timing, you can break out of a boot loop into Download Mode...but it's tricky:
Insert USB Type C cable connected to your PC
Press and hold the Power and Volume Down keys for exactly 7 seconds (hard reset)
Release the Power key and press and hold both Volume Up & Down keys (enter Download Mode)
If you don't see the blue bootloader unlock warning screen, keep repeating the above two steps
The trick here is that you're trying to time your switch to the Download Mode keys for the exact moment the hard reset takes effect. If you see the boot logo while still holding the first key combination, it's too late. If you switch too early, you won't trigger the hard reset.
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Ay, thanks i finally got it into download mode, it gave an error at the top left like kernel rev check fail or smth, it was boot looping and with this trick i got it into the bootloader imma flash stock again, THANKS AGAIN!