Entering and using recovery without buttons on the front panel - MTCB Android Head Units General

I have a KGL VW Passat 8" MTCB unit that somebody (I believe) flashed an Android 5.1 ROM.
This unit does not have physical buttons on the front panel - otherwise I wouldn't be having these sort of problems.
The Bluetooth went awry, so I decided to flash a normal, 4.4 factory system onto it.
Now, the unit doesn't boot up at all - it just gets stuck at the spinning Android logo.
Of course, being that this is a unit that only has touch buttons, entering recovery is IMPOSSIBLE.
I've seen methods of entering recovery on these units mentioned on XDA but I haven't been able to find them fast.
Out of desperation, I used Rockchip's "recovery card" meant for bricked MTCD units and FINALLY the unit is stuck in sort of a "recovery loop", where it boots up, the screen flashes, resets, boots into recovery and stays there until some sort of time out.
The questions are:
- how to normally access recovery in a unit without physical buttons on the front panel?
- how to NAVIGATE inside recovery?

NaviPR said:
I have a KGL VW Passat 8" MTCB unit that somebody (I believe) flashed an Android 5.1 ROM.
- how to NAVIGATE inside recovery?
Click to expand...
Click to collapse
Use a USB keyboard and mouse.

Related

[Q] TWRP stuck in loop

Hello people,
I have an issue with my Phone (i9305) which came to exist doing a factory reset in the normal settings menu (not in recovery).
I rebooted in TWRP recovery, but it's stuck in boot (screen flashes "TEAMWIN" screen over and over)
I wanted to redo the TWRP using Odin3, but it doesn't reconize the phone.
I did find a helpfull post here http://forum.xda-developers.com/showthread.php?t=1974160&page=3 (top post, #21), but the boot with dubbel volume buttons doesn't do anything different for me (other device thing maybe, or what buttons do I all need to press, when to release??).
Does anyone have any suggestions on how I can get TWRP running normally again so I am not stuck with a brick?
Any help will be appreciated!

Possibly Soft-Bricked Moto X with flashing recovery screen

Hopefully you guys can help me with my problem. Recently, I downloaded the new Marshmallow app drawer from Android Pit's "Here's how to get Android Marshmallow's new app drawer on Lollipop". It was successfully installed and seemed to be working fine. However, Google Now gave me a message saying that it was not connected to the microphone and that I should reboot my device. Thinking that the actual reboot key combo was power and volume down, I did this and this brought me to the fastboot page. I selected and entered the power up normally option on the top, which the booted my phone to a completely black screen, from which only the "power off" option would show if I held the power button down. I was confused and concluded that the app drawer somehow soft bricked my phone. After reading up on the web, I went into recovery in the fastboot screen, then selected clear cache. Two lines of orange text appeared at the bottom saying that the cache clear was starting and that it was finishing. I hit the power button, tried to boot my phone up, then, recieving another black screen, brought back up the fastboot menu and tried to enter the recovery screen again so that I could factory reset my device. The recovery screen gave me messages about how it could not load the cache, and since then has been flashing on a set interval on my screen (going black, showing the broken Android with "no command" then going black again).
Any ideas on what I can do to fix this problem?
note: (I have not rooted my phone)
cole_15 said:
Hopefully you guys can help me with my problem. Recently, I downloaded the new Marshmallow app drawer from Android Pit's "Here's how to get Android Marshmallow's new app drawer on Lollipop". It was successfully installed and seemed to be working fine. However, Google Now gave me a message saying that it was not connected to the microphone and that I should reboot my device. Thinking that the actual reboot key combo was power and volume down, I did this and this brought me to the fastboot page. I selected and entered the power up normally option on the top, which the booted my phone to a completely black screen, from which only the "power off" option would show if I held the power button down. I was confused and concluded that the app drawer somehow soft bricked my phone. After reading up on the web, I went into recovery in the fastboot screen, then selected clear cache. Two lines of orange text appeared at the bottom saying that the cache clear was starting and that it was finishing. I hit the power button, tried to boot my phone up, then, recieving another black screen, brought back up the fastboot menu and tried to enter the recovery screen again so that I could factory reset my device. The recovery screen gave me messages about how it could not load the cache, and since then has been flashing on a set interval on my screen (going black, showing the broken Android with "no command" then going black again).
Any ideas on what I can do to fix this problem?
note: (I have not rooted my phone)
Click to expand...
Click to collapse
What is the actual model of your phone. Did you have an unlocked bootloader with TWRP?
The black screen problem can only be fixed by doing a factory reset. After you get into the screen with the dead android and an exclamation mark. You need to press power and volume buttons to make a menu appear. Then choose factory reset. Unfortunately you will lose your data, but this will fix it.
Sent from my XT1095 using Tapatalk
AGISCI said:
The black screen problem can only be fixed by doing a factory reset. After you get into the screen with the dead android and an exclamation mark. You need to press power and volume buttons to make a menu appear. Then choose factory reset. Unfortunately you will lose your data, but this will fix it.
Sent from my XT1095 using Tapatalk
Click to expand...
Click to collapse
I have solved the issue... I believe it was stuck in some sort of loop with the revovery mode, because that was flashing periodically on the screen. I was eventually able to get the recovery screen to actually stay on the screen and then reset it. Thanks for the quick reply!
d33dvb said:
What is the actual model of your phone. Did you have an unlocked bootloader with TWRP?
Click to expand...
Click to collapse
I have solved the issue but the actual model is the Moto X 2nd Generation Pure Editon without the bootloader unlocked for anyone with similar issues. Thanks for helping out!
I'm having the same issue today with a Moto X Gen 1 after accepting Verizon's OTA upgrade to Lollipop. Only I can't boot to recovery.
cole_15 said:
I have solved the issue... I believe it was stuck in some sort of loop with the revovery mode, because that was flashing periodically on the screen. I was eventually able to get the recovery screen to actually stay on the screen and then reset it. Thanks for the quick reply!
Click to expand...
Click to collapse
I'm still having the problem that you were facing and cannot get out of that loop sequence. I've booted over and over, tried to launch recovery and nothing... I see some yellow text at the bottom only briefly staying that something couldn't load, then back to the dead-droid/red triangle (no command) for a split second, over and over... I am stuck.
Pfister07 said:
I'm still having the problem that you were facing and cannot get out of that loop sequence. I've booted over and over, tried to launch recovery and nothing... I see some yellow text at the bottom only briefly staying that something couldn't load, then back to the dead-droid/red triangle (no command) for a split second, over and over... I am stuck.
Click to expand...
Click to collapse
I'm having this exact same problem too! The 'dead droid' just constantly flashes over and over, so I am unable to do anything. There was one time when I held power and the low battery icon showed up with a yellow exclamation mark triangle, but I haven't been able to get that screen again. I contacted Motorola and they told me to try and go to settings and do a factory reset... I just told you I can't turn on my phone! What the hell man. I have tried so many things online and none of them worked. From what I'm reading the only was to fix this is to flash a blank bootloader, but those files haven't been released yet.
The worst part is that I have only been using this phone for ONE DAY!:crying:
cole_15 said:
I have solved the issue... I believe it was stuck in some sort of loop with the revovery mode, because that was flashing periodically on the screen. I was eventually able to get the recovery screen to actually stay on the screen and then reset it. Thanks for the quick reply!
Click to expand...
Click to collapse
How did you get the screen to eventually stay on?
mistervino said:
How did you get the screen to eventually stay on?
Click to expand...
Click to collapse
okay so after several guides and steps, i finally got my Moto X (1st Gen) working again using the tutorial here https://www.youtube.com/watch?v=EWDwyqUF6k4
Essentially i flashed a custom recovery like the PhilZ Touch recovery here http://www17.zippyshare.com/v/40132571/file.html by renaming the "philz_touch_6.58.7-ghost.img" file to "boot.img" in fastboot mode and rebooted after that.
And that was it, phone rebooted and is working fine.

Unable to boot Download mode G920T

Hey,
I have been reading around, but this is my first thread, and I'm looking for some help.
I got a G920T, and I was trying to get a custom rom installed, got twrp working, but after running xtresolite, twisted and VN-ROM installers (yes, i checked to download the ones for my model) and factory wiping had no luck, phone was just stuck at "powered by samsung" screen. So I decided trying to go back to stock, but ODIN gave me only fails.
Tried: AOCG, COF6 and EPD1 getting failed on writing from ODIN, then I realized i couln't get into twrp anymore, so I tried to get to download mode BUT then I couldn't get to it, just got to the green custom os warning screen and pressing any button doesn't get me anywhere, from there I can only turn phone off.
Tried to emergency recover with Smart Switch, but since it doesn't get to Download mode, it's not recognizing phone, and neither does Odin.
So:
-vol down+home+power=green screen/turn off
-No Download mode
Any ideas? I found another guy somewhere asking for same issue, but he got no answers.
Thanks in advance!!
Power off phone first don't restart and try it
Download mode usually always exists even with software screw ups
Power down first then hold volume down +home button then power button keep holding till screen comes up then chose volume up to continue to download mode .
IT takes like a few seconds to get it to power to download mode sometimes between 2-6seconds in my experience
For Odin try newest version and just reflash the idle kernel 3.0.2.0 twrp for s6 6.0.1
Very important you unchecked auto reboot in Odin before you flash twrp again .
You have to manually reboot after it flashes
Then you should be able to swipe to allow modifications then either restore rom backup or sideload a rom.
You can also recover your phone I'f you mount USB otg in twrp and down load a rom to it on the flash drive just a idea
If you wanna go to stock Download uvu3epd1 from Samsung site
Sent from my SM-G920T using XDA-Developers mobile app
Some advance
Hey,
Thanks a lot for your answer androidddaaron!
It came to the point it went off and it wasn't charging when connected. No powered by samsung message, no download mode, nothing, so, in my desperation i placed the phone over a qi charger i use for my nexus7, after about 30-40 minutes, i grabbed it, it was very hot, and not even powering on (just grey battery not moving), so i decided to go deeper, took advantage of the heat to remove back cover and began to strip it apart.
I bridged the power on/off contacts directly on the board, and what was my surprise, powered by samsung message. So i got to figure out the combination for vol- contact on the board (3 contacts for volume: gnd, vol+ and vol-). Turns out i could get this time through and got to download mode . I'm waiting right now for software download to complete, it will probably take a couple hours, since i'm only getting 1.8Mb/s.
Before starting software download with Smart Switch (Odin not working here), i made tests for buttons, they seem to be closing circuit as expected with tester, BUT, when attached to board, i'm not getting the correct behavior, so i'm thinking i might have a faulty vol- or something, right now, working directly on board (no back cover, no aluminium), no buttons, bridging contacts as needed.
I'll wait for smart switch to finish and hopefully getting phone to work. I'll report after that. :fingers-crossed:
Umm.. I don't know what your saying sounds like you tore apart your phone.
The button combo works as I mentioned how to.
Flash the right twrp.. as mentioned with the procedures .
Then USB otg flash a rom
OR try odin flash stock
Best of luck
Sent from my SM-G920T using XDA-Developers mobile app

S2 810, unusual boot issue (official firmware)

Hello and greetings,
I am looking for some help from the gurus here.
I bought this S2 off of ebay, as broken, no power.
plugged in with adequate power supply, the power button was not responding.
I then tried launch recovery mode, and nothing.
Then I found that this tablet would start with download mode enabled.
naturally the battery was flat, but by cancelling download moded, the tablet booted into the system.
the tablet had 5.1.1 and after allowing the tablet battery to charge up to 100%, I then performed a factory reset from within the tablet, and then restarted the tablet to check for issues.
on reboot, the tablet just went black, and again the power button, nor recovery mode would start the tablet, but here i was again able to start the tablet with download mode (cancelling dl mode when initialized).
(i did manage to enter recovery mode, im not sure, i think i was repeatedly trying the button combos and it worked. the recovery menu is untouched vanilla no twrp was installed. i delete the cache, and again performed a factory reset from the recovery console. still, no change in the power button responsiveness from power off)
the next thing I tried was to update the firmware, by grabbing official firmware from updato, and secondarily from samsung-firmware org as a backup source.
both firmwares are official release, 7.0 nougat.
ran odin, and successfully updated the firmware using the file from updato, and the tablet is now running nougat.
everything works great, except when the unit is shut down the power button alone still will not turn the tablet on. (this was the same issue as before i updated the rom to 7.0)
so the next rabbit hole i dug into was creating a bootloader file to see if that would help this issue (extracted the files and compiled into md5 bootloader using Cygwin), the bootloader flashed fine, but still no change to the power button issue. (the Cygwin method can be used to create samsung 4 files repair, but really doesn't do much if you already have the single fat file (firmware))
a couple other oddities:
occasionally the android system installer will go into erase mode, after performing a firmware install from odin, and not complete or reboot.
the system also for the first few seconds after leaving the download mode has graphical artifacts on the screen, just before the samsung logo appears. usually in the bottom half of the screen which are just random blocky colors.
i am pressed for time, and cannot add any more details at the moment, I'll get back later.
any wisdom or insight would be fantastic,
thank you.

Help! Stuck in recovery mode

The Android logo with an exclamation mark and the word "Error!". All the buttons unresponsive. Froze in recovery mode when selected the "Sideload" option by mistake and did not send anything via ADB.
The handset is on STOCK firmware, NOT rooted and has LOCKED bootloader. Not modded in any way; just connected via ADB.
Buttons not responsive. Pressing and holding the power button has no effect.
Do I have to wait until battery drains?
Funny thing, I have rooted phones for years, flashed ROMs, sideloaded, even created a ROM. Not an expert, just curious - and never came across such a situation with a completely locked phone.
This is my primary phone and is badly needed...
Thanks for any hints.
Never mind, after 30 mins or so, the phone suddenly rebooted to system after plugged in. Weird, but things seem to be back to normal.

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