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P9-Lite bricked, stuck in a bootloop,can't access twrp recovery mode or fastboot mode

EDIT: I got to fastboot mode finally, just by trying different USB cable... (am I dumb? yes. really.) I'm sorry for wasting everyone's time that tried to help me!
I tried to install xposed via TWRP, and after that I got stuck in a bootloop, then I tried to install something in panic in twrp in order to fix my phone, and then when I was about to boot, it said "No OS installed are you sure you want to reboot?" I tapped Yes. Now I can't access my recovery mode anymore.
I haven't installed fastboot on my phone or whatever (dont know does it have to be installed to get access to it) but when I try the button combination I'm not accessing the fastboot mode.
I'm stuck in a screen where it says 'Your device has been unlocked and can't be trusted" and in the bottom is says "Your device is booting now..." and does nothing.
Please I really need help, I paid for my phone 300 euros and have had it only like month... also i'm addicted to pokemon go and my p9-lite is the only device I could play it with, and my family isn't the richest one and I can't buy a new one in like a year

)

To access fastboot mode. Make sure the phone is off. Press and hold vol down and insert USB cable. That should bring you to fastboot mode.

n0my said:
To access fastboot mode. Make sure the phone is off. Press and hold vol down and insert USB cable. That should bring you to fastboot mode.
Click to expand...
Click to collapse
not working, just brings me to the same screen where it says "your device has been unlocked and can't be trusted"

what about 3 button combination???
Hold vol- ;vol+ and power button, when huawei logo appers realise power button.
Sugestion. Dont mess with TWRP and zips if u dont know what are u installing.
P.S. DC phoenix can fix your phone, but it cost 15 EUR and u should be able to acced fastboot.
Sent from my EVA-L19 using XDA-Developers mobile app

the 3 button combination doesn't work either.. also DC phoenix won't put me in fastboot right? as I've searched online about it.
And I won't mess with twrp ever again when I get my phone back.

Karibu0 said:
not working, just brings me to the same screen where it says "your device has been unlocked and can't be trusted"
Click to expand...
Click to collapse
connect cable with pc, then connect with phone, only then press volume down and powerbutton about 15 sec, so phone force restart, keep holding vol down. need to be in fastboot mode, if are not ,then its done for you!

Arnys said:
connect cable with pc, then connect with phone, only then press volume down and powerbutton about 15 sec, so phone force restart, keep holding vol down. need to be in fastboot mode, if are not ,then its done for you!
Click to expand...
Click to collapse
well...... I guess my phone is 'done' then

Is there any other ways to install the firmware than fastboot? like some kind of tool on pc so it forces the install and your phone doesn't have to be in fastboot or anything?

Finally got to fastboot mode, just by trying different USB cable... (am I dumb? yes.) I'm sorry for wasting everybody's time!
I'm never gonna do any modding to my phone ever again

Hi, I have a problem with my p9 too. I can't access fastboot or recovery mode. The phone stays on black screen, no led. When i pluged it on usb, he is detected but as "USB SER". How can i do to reflash ?

My P9 have problem who help me......plssss

Brick -> QFil works -> Different Brick??

1A) Accidentally relocked the BL while on custom recovery and rom. Bricked, only turns on to blank black screen w/ solid blue LED.
1B) Able to go QFil Q9008 mode but all attempts result in errors, mostly Saharas. Unable to get into Fastboot
2A) Out of nowhere, days later. From OFF state, Vol+ and Vol- and plug I get the initial screen to scroll to select Reboot, Recovery, Fastboot, Reboot options.
2B) Was able to get into Fastboot and recognized by All-In-One Tool by Mauronofrio but I could not unlock the BL because I could not get a successful unlock file download.
2C) Also was able to get into EDL and what looked like my first successful download/flash in QFil 9008 mode. All previous attempts For the first time I saw progress bars and it was complete, okay/closed.
3A) Nothing happened for a long time so I unplugged and power cycle. Now its still bricked but in a different way. Button combos yield a quick vibration, green LED flicker once, back to all black screen, over and over.
3B) I am assuming I am in a worst brick than before? Now I am unable to get into Fastboot, EDL, computer doesn't even prompt driver issue when its off. Where now?

Hi,
I had the q9008 issue too after flashing the ZUI ROM with QFIL.
Phone turned off itself and then, nothing but a vibration after 15s on power button, and PC recognized it as Q9008 port. No screen, no LED.
I tried to plug it to PC after battery died, and had the red LED. Tried to charge it, and it went alive again. Now it's on AEX and everything is fine.
You can try that way, or follow this guide (I would do that if it would not be alive):
https://redirect.viglink.com/?forma...ww.zukfans.it/2016/07/06/gui...terminali-zuk/

Hi, same problem here.
Did you solve it? How?

Help: I can't access the bootloader on Z3c

Dear XDA users,
I want to unlock my (GFs) Z3c and I am unable to access the bootloader.
Starting the phone with Power + VolDown does not do anything, as long as the VolDown is being held, the screen stays black. When powering up the phone with Power and hit VolDown right after that, there is a loop where the phone shows the Sony logo and turns black each ~15 seconds.
Executing "adb reboot bootloader" shuts off the phone (the LED shows blue after that).
The device is a refurbished one with branding from "Telekom Germany" that we got as a replacement from our phone insurance after dropping the first one.
Is it possible that the bootloader is hidden somehow or missing/faulty?
What can I do?
I have working Flashtool and ADB on Win10 Pro (with disabled driver signature checks).

die_braut said:
Dear XDA users,
I want to unlock my (GFs) Z3c and I am unable to access the bootloader.
Starting the phone with Power + VolDown does not do anything, as long as the VolDown is being held, the screen stays black. When powering up the phone with Power and hit VolDown right after that, there is a loop where the phone shows the Sony logo and turns black each ~15 seconds.
Executing "adb reboot bootloader" shuts off the phone (the LED shows blue after that).
The device is a refurbished one with branding from "Telekom Germany" that we got as a replacement from our phone insurance after dropping the first one.
Is it possible that the bootloader is hidden somehow or missing/faulty?
What can I do?
I have working Flashtool and ADB on Win10 Pro (with disabled driver signature checks).
Click to expand...
Click to collapse
1. Check if bootloader unlock allowed = yes, (open dialer, enter *#*#7378423#*#* and go to service info-configuration).
2. If yes, unlock bootloader - https://developer.sonymobile.com/unlockbootloader/unlock-yourboot-loader (backup ta if you want - https://forum.xda-developers.com/cr...versal-dirtycow-based-ta-backup-t3514236/amp/)
3. Flash recovery: install official TWRP app, select recovery for Z3c, download and flash on computer with terminal command 'fastboot flash recovery'.

I confirm the same issue as OP. I've downloaded the respective firmware and have confirmed via the service page that the bootloader is unlocked.
Now I'm trying to boot into fastboot via "adb reboot bootloader" and my phone looks like it turns off (no notification lights). When I type "adb devices" and "fastboot devices" both are blank ("adb devices" could find the device prior to the reboot command).
I also tried the Sony instructions and pressing Vol Up + Plugging in USB and this also has the same result as above. Not sure what to do next.
Update: I'm using Windows 10 and the problem was that it would not install the unsigned drivers that came with Flashtool. Once I rebooted Windows in troubleshooting mode (Shift + Restart) and disabled the signed driver requirement, Flashtool installed correctly. I reflashed the phone for good measure and now following the normal steps fastboot devices picks up the phone.

[Guide] unlock T510 bootloader

Disclaimer: your tablet warranty will void. Proceed with your own risk
Warning: your personal data, except on external SD card or USB drive, will be wiped during the process!
Prerequisite:
Host PC installed Samsung Smart Switch
USB C cable
Your tablet battery should be 70% or higher and you have done data backup
OEM Unlock enabled
1. About tablet
2. Software version
3. Hit Build Number few times
4. Enable USB Debugging
5. Allow your host computer
6. If you don't see OEM Unlocking, wait for 7 days or do the following trick
https://www.xda-developers.com/fix-...y-s9-samsung-galaxy-s8-samsung-galaxy-note-8/
Are you ready? Let's do it.
1. Turn your tablet off and disconnect USB cable
2. Press and hold both volume up and down buttons and connect to host computer
3. You should see factory reset screen, but this time you should see one more option. Press and hold volume up to unlock the bootloader.
4. If you see a warning screen on boot, the bootloader is unlocked.
Currently I am still finding how to make patched boot and post update later how to root.

John Wu, the developer of Magisk, already has an excellent guide for rooting the Samsung Exynos devices here: https://topjohnwu.github.io/Magisk/samsung
(Just ignore references to the Bixby button.)

Magendanz said:
John Wu, the developer of Magisk, already has an excellent guide for rooting the Samsung Exynos devices here: https://topjohnwu.github.io/Magisk/samsung
(Just ignore references to the Bixby button.)
Click to expand...
Click to collapse
The only issue is to find right boot. I couldn't find from sammobile

Magendanz said:
John Wu, the developer of Magisk, already has an excellent guide for rooting the Samsung Exynos devices here: https://topjohnwu.github.io/Magisk/samsung
(Just ignore references to the Bixby button.)
Click to expand...
Click to collapse
I followed his guide except there's no bixby button but something goes wrong.
Even KNOX tripped, I don't see root no matter how I try.
***** update *****
This time I started all over and patched AP with Magisk provided in the link and this time it worked.
Press and hold both power and volume buttons to turn it on. Release both buttons when the screen flashes briefly (it bypasses bootloader warning) and you will enter system with Magisk.

Unlocking with Linux?
This thread is the only one I see that describes how to unlock the T510. Unfortunately it requires the Samsung migration tool (why?) and it doesn't exist on Linux. I've tried hooking up Heimdall 1.4.2, but I only see the download mode screen. I can either flash something or restart. I got the PIT from the device now, but I don't see a way to unlock the bootloader. Can it be done with Linux?
Well, I decided to go verify the OEM unlock switch (which I ticked yesterday successfully), and it was unset. I just re-set it, and I have the unlock option. I don't need to have the migration tool on my computer, thankfully.

@milsabords From the Nexus Stock ROM thread -
milsabords said:
So far I have not succeeded unlocking the boot loader.
Dumb question %-( : instructions say to press Volume Up AND Volume Down. There is only ONE Vomume button wth three positions, Idle, Up and Down. How can I mash Up and Down at the same time ?
Should I do it power-on or power-off, with or without USB cable connected to my PC ?
Click to expand...
Click to collapse
MossyTC said:
There are no dumb questions! Only dumb people asking dumb ... wait that doesn't sound right ...
Anyway - the Up and Down parts of the volume button can be pressed at the same time. You can see this if you first press the Up part, and while keeping the Up part pressed you can then also press the Down part.
Do this while the device is off, USB cable not connected, then connect the USB cable.
Click to expand...
Click to collapse
milsabords said:
Thanks, it did not work, tablet in power off state would not get alive pressing either Vol keys..
Shoud I mash the power button while pressing the Volume Up, then the Volume Down buttons ?
Click to expand...
Click to collapse
MossyTC said:
It should work with only the Volume and Volume down buttons held down when the USB cable is connected from the computer.
Click to expand...
Click to collapse
milsabords said:
Did not work.
On the powered offed screen while connected to the PC I see a 100% level in the middle and yellow triangle with an USB picture at the bottom.
Pressing either Vol key does nothing.
In an earlier post you advised not to connect ???
Note: I have a 2016 Tab A, running RR Pie. Never had this kind of problem with it.
Click to expand...
Click to collapse
What I actually said earlier was that you should be holding down the volume buttons when you connect.
To be clear, and as per the OP -
DIsconnect the cable
Hold down the Volume buttons and keep them held down until after the next step
Connect the USB cable from the tablet to the computer (which should be on at this point)
You should see the factory reset screen

MossyTC said:
@milsabords From the Nexus Stock ROM thread -
/
What I actually said earlier was that you should be holding down the volume buttons when you connect.
To be clear, and as per the OP -
DIsconnect the cable
Hold down the Volume buttons and keep them held down until after the next step
Connect the USB cable from the tablet to the computer (which should be on at this point)
You should see the factory reset screen
Click to expand...
Click to collapse
I'm not sure @milsabords understands that the vol button is NOT a "rocker switch", where you press one end or the other, but TWO switches where you CAN press both ends at the same time and, while holding both ends down, you plug in the USB cable. There is no need to press the power button. A green screen will appear and then you release both buttons and follow the on screen instructions.
edit: And, BTW, you didn't have this problem with the T58x because its bootloader was never locked.

@MossyTC and @lewmur
Thanks a lot for your patience. It worked.

Tab A T510 USA
I have the variant from best buy just purchased it today. I did the date&time trick and the Unlock Bootloader option doesn't appear. I'm not sure how to proceed its a USA one does that matter?

TheGreyGoose said:
I have the variant from best buy just purchased it today. I did the date&time trick and the Unlock Bootloader option doesn't appear. I'm not sure how to proceed its a USA one does that matter?
Click to expand...
Click to collapse
i bought a T510 from best buy about a month ago and took me a whole 2 minutes to unlock and get twrp and root
i hope u didnt buy a carrier model that cant be unlocked lol

Another prerequisite, at least for me anyways, is to update the operating system on the tablet first. I bought my tablet brand new and tried to unlock the bootloader. The Smart Switch software did not recognize my tablet when I go to the unlock bootloader screen, so it wouldn't do it. I had to boot back into the OS and update to Android 9. After that, Smart Switch worked and the bootloader unlocked by following the directions in OPs post.

Hi,
I've followed instruction and got the unlocked warning on reboot. The device appears to be unlocked.
Odin failed to flash TWRP with the device showing "Only official released binaries are allowed to be flashed (BOOT)" in red.
I went into developer option, there is no longer an entry for OEM unlocking.
I then did the time trick and reboot the device. Not sure if this step matter. But after that the option showed up greyed out, saying the bootloader is already unlocked.
All good now

kindum said:
Ist ist possible to relock the the device later? For example with the ADB command that the warning will be away?
Click to expand...
Click to collapse
ADB isn't needed. You use the same procedure to relock it as you did to unlock. When you do that, the option will be to lock rather than unlock.

PC doesn't see device
When I follow this procedure, I do get to the right screen on the tablet, but my PC does not see the tablet at all.
Same thing happens with download mode. It only works if I enter download mode by ADB command.

fritz.barnes said:
When I follow this procedure, I do get to the right screen on the tablet, but my PC does not see the tablet at all.
Same thing happens with download mode. It only works if I enter download mode by ADB command.
Click to expand...
Click to collapse
sounds like a pc issue

fritz.barnes said:
When I follow this procedure, I do get to the right screen on the tablet, but my PC does not see the tablet at all.
Same thing happens with download mode. It only works if I enter download mode by ADB command.
Click to expand...
Click to collapse
When you follow what proceedure? The correct proceedure doesn't require the PC to "see" the tablet. Plugging the cable into a PC is ONLY to bring up the unlock screen on the tablet. You can't do it by plugging into a charger because the tablet won't get the correct response on the data lines. But once you get the right screen on the tablet, you can unplug the cable and still proceed with the unlock routine.
edit: I think the only reason Samsung came up with this routine is that there isn't a physical Home button to press and they want to make sure the combination of buttons won't be pushed "accidentally". They WANT it to be very difficult to unlock.

Sm-t510
elliwigy said:
i bought a T510 from best buy about a month ago and took me a whole 2 minutes to unlock and get twrp and root
i hope u didnt buy a carrier model that cant be unlocked lol
Click to expand...
Click to collapse
Iam trying to root the samsung sm-t510 2019 model. I have set the developer optie to unlock, but iam still getting the bootloader is locked....why...

Wigwam0 said:
Iam trying to root the samsung sm-t510 2019 model. I have set the developer optie to unlock, but iam still getting the bootloader is locked....why...
Click to expand...
Click to collapse
Have you actually read the instructions? The OEM enable and the bootloader lock are two entirely different things. Until the latest models, Samsung tablets didn't have locked bootloaders unless they were "carrier" models. Now, in addition to enabling OEM in developer mode, you also need to unlock the bootloader prior to using Odin. I'm not going to list the instructions again because they are already posted.

Is there a way to check if bootloader is unlocked?

winstonwlau said:
Is there a way to check if bootloader is unlocked?
Click to expand...
Click to collapse
When you turn the tablet on, you will see a warning screen telling you that the tablet is in danger if the bootloader is unlocked.

Question Stuck in bootloop, cannot reach fastboot

Hey, I have tried flashing a GSI ROM but got an error after attempting these two commands :
MrScarl3t said:
./fastboot erase system
./fastboot flash system Gsi.img
Click to expand...
Click to collapse
The "system" partition could not be found and after reading some of your comments I figured I had to reboot into fastbootd and not fastboot. Therefore I rebooted my phone but I am now stuck into a bootloop without being able to reach fastboot whatsoever. Holding down the volume down key does not seem to have any effect.
A few more details:
- adb does not detect my device anymore.
- I was previously on a stock ROM.
- I only managed to flash the vbmeta.img before the bootloop happened.
- Upon holding the volume up button, my phone briefly connects to my PC (for about 2 seconds) then disconnects and restarts again.
What could I do to be able to reach fastboot and flash the stock ROM again?
Thanks for reading

Hold power button + volume down button for 30 second if fails then drain the battery then repeat the process.

My battery is drained and no matter how long I hold the two buttons I can't get out the bootloop unfortunately...

-let the cable connected to pc and press (+ and power) when the splatch screen appears wait 3 secondes and release the power button keeping + button only.
-if not, try with an OTG disk inserted and do the same as above.
-if not, type on pc terminal: adb reboot recovery before connecting your phone.
Good luck.

Hey, thanks a lot for your reply
I have tried all the steps you've described me and I unfortunately can't reach recovery.
It seems as if the phone is reacting to it though as a black screen screen is displayed much longer than usual, although a few seconds later, the MI splash screen appears once again. Also, I can hear the beep from the pc when the phone connects but it keeps disconnecting 1 second later and proceeds to reboot. Seems like recovery is corrupted or something...
The phone does not show up under adb devices throughout the whole process. My pc only recognizes the usb port being connected (when the beeps are triggered) but does not identify the device as an android device.