Database Info

"Key Driver Not Found.. " on Bootloader 4.2.1

So this morning my brother was using his TF300T in its dock. He undocked it and the screen went blank. Screen was still on but nothing displayed. I rebooted it for him (volume down and power button for 10s). After a minute of it powered on the screen went blank again, so I rebooted it again, but this time the Asus splash screen displays and the lock screen flickers before quickly going blank.
Thought a reinstall of the ROM would fix the problem but I now can't even boot into recovery or fastboot! Had no problem the first time I rebooted and selected cold-boot in the bootloader options. With the tablet on and screen blank I plugged it into a PC and Win7 detected and installed the proper drivers (I think). ADB commands seem to work, but the command to boot into bootloader only resets the tablet. Fastboot command does not work. Also noticed the below message flash before a flicker of bootloader options are shown. The PC seems to have access to the internal storage (I can see folders from the tablet) when plugged in via USB.
"Key driver not found.. Booting OS
Android cardhu-user bootloader <2.00 e> released by "US_ePad-10.6.1.8-20130PPt" A03"
Could it be a hardware issue? I ask because I see similar problems with the Asus splash screen indicative of a logic board problem when diagnosing a PC (images pixelated)...

MaMMiTs said:
So this morning my brother was using his TF300T in its dock. He undocked it and the screen went blank. Screen was still on but nothing displayed. I rebooted it for him (volume down and power button for 10s). After a minute of it powered on the screen went blank again, so I rebooted it again, but this time the Asus splash screen displays and the lock screen flickers before quickly going blank.
Thought a reinstall of the ROM would fix the problem but I now can't even boot into recovery or fastboot! Had no problem the first time I rebooted and selected cold-boot in the bootloader options. With the tablet on and screen blank I plugged it into a PC and Win7 detected and installed the proper drivers (I think). ADB commands seem to work, but the command to boot into bootloader only resets the tablet. Fastboot command does not work. Also noticed the below message flash before a flicker of bootloader options are shown. The PC seems to have access to the internal storage (I can see folders from the tablet) when plugged in via USB.
"Key driver not found.. Booting OS
Android cardhu-user bootloader <2.00 e> released by "US_ePad-10.6.1.8-20130PPt" A03"
Could it be a hardware issue? I ask because I see similar problems with the Asus splash screen indicative of a logic board problem when diagnosing a PC (images pixelated)...
Click to expand...
Click to collapse
It is unlikely windows installed the proper drivers for adb and fastboot. The drivers for accessing the internal sdcard yes.
See my signature for installing proper drivers in windows 7 and another for entering the bootloader after you have the proper drivers.
When I have seen that message it does not relate to hardware but software.
I don't suggest plugging and unplugging the dock when powered.

tobdaryl said:
It is unlikely windows installed the proper drivers for adb and fastboot. The drivers for accessing the internal sdcard yes.
See my signature for installing proper drivers in windows 7 and another for entering the bootloader after you have the proper drivers.
When I have seen that message it does not relate to hardware but software.
I don't suggest plugging and unplugging the dock when powered.
Click to expand...
Click to collapse
Will try what you suggested, but does it matter that I'm using the same PC I used to initially fastboot TWRP to the tablet? I thought once the driver is installed it there would be no need to re-install the driver...

MaMMiTs said:
Will try what you suggested, but does it matter that I'm using the same PC I used to initially fastboot TWRP to the tablet? I thought once the driver is installed it there would be no need to re-install the driver...
Click to expand...
Click to collapse
It will probably be ok. I was going by your comment "I plugged it into a PC and Win7 detected and installed the proper drivers (I think)"

tobdaryl said:
It will probably be ok. I was going by your comment "I plugged it into a PC and Win7 detected and installed the proper drivers (I think)"
Click to expand...
Click to collapse
Yeah. My problem is I can't get to fastboot mode on the tablet itself, and based on what I saw on another thread it seems like I'm going to have to replace the mainboard .

MaMMiTs said:
Yeah. My problem is I can't get to fastboot mode on the tablet itself, and based on what I saw on another thread it seems like I'm going to have to replace the mainboard .
Click to expand...
Click to collapse
OK.
Good Luck!

I unplug mine and reconnect all the time when on. Never had a issue.
Sent from magical jelly bean.

My brother's TF300T is back up and running!
As a last resort I opened it up to disconnect the battery. Still could not get into fastboot, so I left the battery plugged in and let the battery run out. After 48 hours of the battery being completely dead I charged it fully to see if I could do anything. Battery LED indicator was green and the first thing I noticed was that the unit was still off. (I wasn't able to completely shut it down before letting the battery completely drain). I powered it on thinking it would display a blank screen, but it powered up as usual! Everything seems to be working. I immediately flashed CROMI-X 4.3b6 on it (what my brother originally wanted me to do).
Thought I'd post this as a last resort hope for those who think they may have bricked their machine. I do recall completely draining the battery then waiting over 24 hours as a solution for one of the many machines I've hacked. Just thought disconnecting the battery would achieve the same purpose. Guess I was wrong . Hopefully this is a solution for someone else out there who may have bricked their machine. Sure doesn't hurt to try .
I'm actually mystified as to why this worked. Anyone know? I'm guessing completely draining the battery reset whatever was inside. I also have noticed more users have reportedly bricked their machines after Android 4.2.1. Coincidental? Thank God I'm perfectly happy with Android 4.1.1 based CROMI v3.4.6 .

[Q] Hard Bricked my Nexus, possibly?

After flashing a nightly of CM10.2, my phone never booted and instead got stuck in fastboot. My power button has also been broken for months, so it's impossible to navigate the menus in the fastboot ui. When I take my battery out, it automatically boots into fastboot on its own.
Additionally, I found a way to boot into recovery without a power button, but the device is not being recognized as plugged in by my computer.
Any help??? It'd be greatly appreciated, I'm without a phone until I can find a way to fix this.

sinaisinai43 said:
After flashing a nightly of CM10.2, my phone never booted and instead got stuck in fastboot. My power button has also been broken for months, so it's impossible to navigate the menus in the fastboot ui. When I take my battery out, it automatically boots into fastboot on its own.
Additionally, I found a way to boot into recovery without a power button, but the device is not being recognized as plugged in by my computer.
Any help??? It'd be greatly appreciated, I'm without a phone until I can find a way to fix this.
Click to expand...
Click to collapse
I'm having the same exact issue, except with SlimBean 4.3. My phone is stuck in Fastboot (and says "FASTBOOT - NO BOOT OR RECOVERY IMG") and my phone will charge but can't be detected by *any* computer. I've tried three Windows 7 PCs of different makes and an Ubuntu 13.04 box and three different USB cables that all connect my other phone and my tablet fine - none can see it. (It was connecting fine to PC including being seen by ADB prior to this)
My power button is working, but it is also automatically booting into fastboot on its own when I plug it into the computer. Any of the options (besides "Power Off", which performs as advertised) just brings it back to Fastboot.
When I say can't be detected by a computer, I mean there is no USBDeview device listed and there is no 'connect' or 'disconnect' sound on the PC. ADB can't see it.

Yeah, it's strange. Did you find a solution yet, by chance?

sinaisinai43 said:
Yeah, it's strange. Did you find a solution yet, by chance?
Click to expand...
Click to collapse
Nothing yet. Thinking of buying an phone with a busted screen or something and swapping out the internals... I think it's PROBABLY the NAND chip. What I'm suspecting is that because there are several versions of the Nexus S, we might have used the wrong images. I have no idea if this is correct, but it's the only thing I can think of.
My phone's sticker says i9020 on the inside, but D720 (or whatever) when I look up the EIN.

Just hoping somebody sees this and offers a suggestion... I'm getting ready to buy a refurb and put the 'new' body over it so at least I have a functioning, new-ish phone.

!!HELP!! Oneplus One HardBrick

Maybe this has been solved before but so far I haven't found a solution to my OPO Hardbrick and I really need of your help. I tried flashing resurrection remix to my OPO and I guess it went wrong, I tried restoring my backup and it didn't work so I decided to factory reset it which deleted the rom. Now, I have used several tool kits and they all seem to have not worked, it only removed my custom recovery (TWRP) and replaced it with the Cyanogen Recovery, now my phone doesn't even turn on, its all black and vibrates, I am able to use the tool kits using the volume up and power button, but no fastboot, any solutions? Thank you so much

Ok, first step is not to panic and don't do crazy stuff and go over logically. There is no help in starting to flash stuff when your pc doesn't properly connect to your phone.
Does your pc recognize the phone when you insert the USB port after you placed it in the vol+ and power on mode (fastboot)? If yes the device should be seen in the device manager as a android or usb thing.
Check with skipsoft toolkit if you see the device with adb. Do you see any number?

Don't panic here is the solution
https://forum.xda-developers.com/oneplus-one/general/guide-unbrick-oneplus-one-t3013732

Juan_Cuen said:
Maybe this has been solved before but so far I haven't found a solution to my OPO Hardbrick and I really need of your help. I tried flashing resurrection remix to my OPO and I guess it went wrong, I tried restoring my backup and it didn't work so I decided to factory reset it which deleted the rom. Now, I have used several tool kits and they all seem to have not worked, it only removed my custom recovery (TWRP) and replaced it with the Cyanogen Recovery, now my phone doesn't even turn on, its all black and vibrates, I am able to use the tool kits using the volume up and power button, but no fastboot, any solutions? Thank you so much
Click to expand...
Click to collapse
Like the other people are saying, don't worry, it's probaly not that big of a deal. I had this before. Try booting into fastboot mode and reflash TWRP recovery using the method showcased in this video: https://www.youtube.com/watch?v=KZaajUEybNM (you need to skip through it a little). Make sure you have all the proper drivers installed on your computer.

The phone doesn't go into fastboot, but it is recognized by my computer as QU something with a q, with the qualcomm drivers, I have managed to only let it be recognized via tool kits, It doesn't go into fastboot or anything. I have tried the ColorOS toolkit but apparently its more succesful if I try it on an XP computer. Whenever I hold the power and Volume Up the Phone vibrates and is recognized by the tool kit

Worst case scenario ****up, need help badly :(

After 8 years of tinkering with Android phones I have no clue how this happened.
PIXEL 2 (Walleye, non-xl)
Tried getting TWRP and ElementalX working but either one or both weren't doing there thing, though I could at least boot and use my phone normally. Finally ended in a situation where I couldn't boot passed fastboot with an error at the bottom "ERROR: LoadImageAndAuth Failed: Load Error". Found a fix that said to change the active partition. Set it to b and that worked and surprise it loads TWRP...so somehow TWRP was installed, but I can't actually load Android.
Grabbed the latest factory image and manually flashed all the files in the zip-within-the-zip. Everything flashed with no hiccups so I rebooted to bootloader with the intention to then reboot the system, and now this is happening:
TLDR Phone won't turn on. Holding PWR+VolDown SEEMS to do nothing, but it actually flashes a line on the screen like it's trying to load something for a milisecond, then does nothing. Holding PWR+VolUp does nothing. Holding PWR+VolUp+VolDown does the same screen flash followed by the notification LED blinking red 2 or 3 times. Please help!
EDIT: if it matters, the phone is about 50% battery and currently still on judging purely by the fact that it's been warm for about an hour.

sorry for your troubles, i have yet to see this with our phones. Just to get some more information, what happens when you try and charge it? If you plug your phone in to a computer via USB, does it show up in devices? If it shows in devices, can you run platform-tools and see if it shows up via fastboot devices with an ID? If you can connect to fastboot, you could attempt to flash images that way.

djer34 said:
sorry for your troubles, i have yet to see this with our phones. Just to get some more information, what happens when you try and charge it? If you plug your phone in to a computer via USB, does it show up in devices?
Click to expand...
Click to collapse
Nothing happens if I plug into the computer, no sound and not listed in devices. Plugging it in to the charger does nothing except possibly charges it, but I wouldn't know because the screen doesn't seem to be able to turn on for more than a milisecond of a flash.

I had this same problem when I flashed Elemental X kernel over top of the flash kernel and all I did was use the flash-all script that is included with the system image from google. This got me back to my OS where I flashed elemental and magisk. Do you have insurance through your provider?

Another brick?

Hello.
I did something wrong while trying to flash TWRP on my pixel 2, I am now stuck at the bootloader, and I cannot boot System or Recovery. While at the bootloader screen, it says Device State : unlocked. If I try to get to download mode, it says "ERROR: Operation Denied". If I try to go into recovery, it says "ERROR: Slot Unbootable: Load Error". If I try "Start", I get the same error message.
Also, adb or fastboot don't seem to be able to "see" the pixel connected to the computer. I believe my cables are good since I was able to flash Magisk and reflash the whole system with them before bricking it.
Can anyone help?
Thanks!

stanelie said:
Hello.
I did something wrong while trying to flash TWRP on my pixel 2, I am now stuck at the bootloader, and I cannot boot System or Recovery. While at the bootloader screen, it says Device State : unlocked. If I try to get to download mode, it says "ERROR: Operation Denied". If I try to go into recovery, it says "ERROR: Slot Unbootable: Load Error". If I try "Start", I get the same error message.
Also, adb or fastboot don't seem to be able to "see" the pixel connected to the computer. I believe my cables are good since I was able to flash Magisk and reflash the whole system with them before bricking it.
Can anyone help?
Thanks!
Click to expand...
Click to collapse
happened to my walleye too , and managed to bring it back to life . check this thread for a possible solution. https://forum.xda-developers.com/pixel-2/help/december-factory-image-to-broken-t3875213

Thanks!
I missed that thread while researching this issue.
I will try these things when I get back from work next week.
Thanks again!

stanelie said:
Thanks!
I missed that thread while researching this issue.
I will try these things when I get back from work next week.
Thanks again!
Click to expand...
Click to collapse
Just as a reference for anyone else who needs the fix and can't be bothered opening another thread.
SOLUTION: At the menu where it is stuck and saying device fail etc, plug in your usb cable to the mobile, press and hold the POWER button for 10 seconds, it will now recognise your phone under fastboot.
Once that is cleared, it's pretty much straightforward flashing latest pixel 2 image via fastboot and problem solved.
sidenote: Issue came with anyone who tried to flash december security updates and above as of what I heard.

I will try that, thanks.

So, several things :
Holding down the power button had no effect other than restarting the boot menu, but Fastboot never became available.
Opening up the phone and disconnecting the battery and reconnecting it made Fastboot available again. This would be in line with other users that let the phone battery discharge completely before regaining fastboot access.
Sidenote : opening up this phone is not for the faint of heart. I managed to damage something on the motherboard doing so (probably a static electricity discharge), the screen ended up displaying gibberish. I was able to salvage my phone by replacing the motherboard. I had ordered a replacement motherboard when I thought all was lost with no fastboot, and I had it on hand. Expensive little sucker...

stanelie said:
Hello.
I did something wrong while trying to flash TWRP on my pixel 2, I am now stuck at the bootloader, and I cannot boot System or Recovery. While at the bootloader screen, it says Device State : unlocked. If I try to get to download mode, it says "ERROR: Operation Denied". If I try to go into recovery, it says "ERROR: Slot Unbootable: Load Error". If I try "Start", I get the same error message.
Also, adb or fastboot don't seem to be able to "see" the pixel connected to the computer. I believe my cables are good since I was able to flash Magisk and reflash the whole system with them before bricking it.
Can anyone help?
Thanks!
Click to expand...
Click to collapse
Same thing happened to me except I never even tried to root. Just pulled the phone out of my pocket, and the little Android dude was belly up. It's showing device locked - and although I had it in Dev. mode from weeks back (thought USB Debugging was enabled) it fails to respond to adb commands, boot-loader mode, etc.
...Looks like Google laid an egg with this one.

Pixel 2 - "ERROR: Slot Unbootable: Load Error"
If you get the above error you will find that you cannot boot into recovery and the phone stays in the bootloader screen each time you try to start the phone. If your bootloader is unlocked you might be able to recover your phone to flash a stock image and revive. My problem started when I tried to restore a nandroid backup after trying out Android Q beta 1. I got the error mentioned above.
Most of the people recommended that I get a replacement from Google support as they had tried everything but it didn't work. Well right here in XDA Pixel 2 forum there is a solution waiting to be used. I am reproducing it from the post titled
"December factory image seems to have broken fastboot enumeration"
Quote
A possible way to resurrect a bricked Pixel 2...
Hey guys, I have just been able to get mine alive. The device started to be recognized (USB/fastboot) after about 10 unsuccessful attempts to start the system: "Start", from bootloader.
So what exactly happened and what I did:
1. Bricked a Pixel 2.
2. It started into bootloader and showed the "slot unbootable" error.
3. The device was not recognized by any of my machines at all, lsusb did not show anything new in the system, and, respectively, fastboot did not see the device.
4. The default option in the bootloader is "Start" if I remember correctly. So I just pressed the power button and did not release it until I noticed a vibration. It were about 10 unsuccessful attempts of system loading before that vibration.
5. Right after that vibration I connected a generic (NONAME) USB-C <-> USB-A cable to both the device and my Linux machine, and fortunately the device was recognized by the system and fastboot was able to detect the device correctly. So I flashed the a factory image, and it went just fine.
Unquote
Let me confirm that this works. I kept the power button down while the phone was connected via USB to the PC for at least 5 mins. During several reboots suddenly I got a beep from the PC which indicated that ADB was working. I flashed a stock image and voila the pixel 2 is back in operation.
Hope this helps several other people who might have this problem.

ashokabs said:
If you get the above error you will find that you cannot boot into recovery and the phone stays in the bootloader screen each time you try to start the phone. If your bootloader is unlocked you might be able to recover your phone to flash a stock image and revive. My problem started when I tried to restore a nandroid backup after trying out Android Q beta 1. I got the error mentioned above.
Most of the people recommended that I get a replacement from Google support as they had tried everything but it didn't work. Well right here in XDA Pixel 2 forum there is a solution waiting to be used. I am reproducing it from the post titled
"December factory image seems to have broken fastboot enumeration"
Quote
A possible way to resurrect a bricked Pixel 2...
Hey guys, I have just been able to get mine alive. The device started to be recognized (USB/fastboot) after about 10 unsuccessful attempts to start the system: "Start", from bootloader.
So what exactly happened and what I did:
1. Bricked a Pixel 2.
2. It started into bootloader and showed the "slot unbootable" error.
3. The device was not recognized by any of my machines at all, lsusb did not show anything new in the system, and, respectively, fastboot did not see the device.
4. The default option in the bootloader is "Start" if I remember correctly. So I just pressed the power button and did not release it until I noticed a vibration. It were about 10 unsuccessful attempts of system loading before that vibration.
5. Right after that vibration I connected a generic (NONAME) USB-C <-> USB-A cable to both the device and my Linux machine, and fortunately the device was recognized by the system and fastboot was able to detect the device correctly. So I flashed the a factory image, and it went just fine.
Unquote
Let me confirm that this works. I kept the power button down while the phone was connected via USB to the PC for at least 5 mins. During several reboots suddenly I got a beep from the PC which indicated that ADB was working. I flashed a stock image and voila the pixel 2 is back in operation.
Hope this helps several other people who might have this problem.
Click to expand...
Click to collapse
I don't even know how to thank you. I almost had a heart attack watching my Pixel bricked. Thanks man!

Save my day! I just keep pressing power button and fastboot response finally!

Can this be done if the device is locked?

_Kalyan said:
I don't even know how to thank you. I almost had a heart attack watching my Pixel bricked. Thanks man!
Click to expand...
Click to collapse
Does ur bootloader locked or unlocked?
---------- Post added at 11:36 AM ---------- Previous post was at 11:36 AM ----------
ashokabs said:
If you get the above error you will find that you cannot boot into recovery and the phone stays in the bootloader screen each time you try to start the phone. If your bootloader is unlocked you might be able to recover your phone to flash a stock image and revive. My problem started when I tried to restore a nandroid backup after trying out Android Q beta 1. I got the error mentioned above.
Most of the people recommended that I get a replacement from Google support as they had tried everything but it didn't work. Well right here in XDA Pixel 2 forum there is a solution waiting to be used. I am reproducing it from the post titled
"December factory image seems to have broken fastboot enumeration"
Quote
A possible way to resurrect a bricked Pixel 2...
Hey guys, I have just been able to get mine alive. The device started to be recognized (USB/fastboot) after about 10 unsuccessful attempts to start the system: "Start", from bootloader.
So what exactly happened and what I did:
1. Bricked a Pixel 2.
2. It started into bootloader and showed the "slot unbootable" error.
3. The device was not recognized by any of my machines at all, lsusb did not show anything new in the system, and, respectively, fastboot did not see the device.
4. The default option in the bootloader is "Start" if I remember correctly. So I just pressed the power button and did not release it until I noticed a vibration. It were about 10 unsuccessful attempts of system loading before that vibration.
5. Right after that vibration I connected a generic (NONAME) USB-C <-> USB-A cable to both the device and my Linux machine, and fortunately the device was recognized by the system and fastboot was able to detect the device correctly. So I flashed the a factory image, and it went just fine.
Unquote
Let me confirm that this works. I kept the power button down while the phone was connected via USB to the PC for at least 5 mins. During several reboots suddenly I got a beep from the PC which indicated that ADB was working. I flashed a stock image and voila the pixel 2 is back in operation.
Hope this helps several other people who might have this problem.
Click to expand...
Click to collapse
Works on bootloader state locked or not?

SoKa1993 said:
Does ur bootloader locked or unlocked?
---------- Post added at 11:36 AM ---------- Previous post was at 11:36 AM ----------
Works on bootloader state locked or not?
Click to expand...
Click to collapse
If the boot loader is locked look for a script for unlocking the bootloader from recovery or bootloader state. I did find it but cannot remember. My bootloader was unlocked so I did not have to use it.

ashokabs said:
Pixel 2 - "ERROR: Slot Unbootable: Load Error"
If you get the above error you will find that you cannot boot into recovery and the phone stays in the bootloader screen each time you try to start the phone. If your bootloader is unlocked you might be able to recover your phone to flash a stock image and revive. My problem started when I tried to restore a nandroid backup after trying out Android Q beta 1. I got the error mentioned above.
Most of the people recommended that I get a replacement from Google support as they had tried everything but it didn't work. Well right here in XDA Pixel 2 forum there is a solution waiting to be used. I am reproducing it from the post titled
"December factory image seems to have broken fastboot enumeration"
Quote
A possible way to resurrect a bricked Pixel 2...
Hey guys, I have just been able to get mine alive. The device started to be recognized (USB/fastboot) after about 10 unsuccessful attempts to start the system: "Start", from bootloader.
So what exactly happened and what I did:
1. Bricked a Pixel 2.
2. It started into bootloader and showed the "slot unbootable" error.
3. The device was not recognized by any of my machines at all, lsusb did not show anything new in the system, and, respectively, fastboot did not see the device.
4. The default option in the bootloader is "Start" if I remember correctly. So I just pressed the power button and did not release it until I noticed a vibration. It were about 10 unsuccessful attempts of system loading before that vibration.
5. Right after that vibration I connected a generic (NONAME) USB-C <-> USB-A cable to both the device and my Linux machine, and fortunately the device was recognized by the system and fastboot was able to detect the device correctly. So I flashed the a factory image, and it went just fine.
Unquote
Let me confirm that this works. I kept the power button down while the phone was connected via USB to the PC for at least 5 mins. During several reboots suddenly I got a beep from the PC which indicated that ADB was working. I flashed a stock image and voila the pixel 2 is back in operation.
Hope this helps several other people who might have this problem.
Click to expand...
Click to collapse
I have same problem. I use Pixel 2 and Fedora. My question is, what i exactly should do? I mean the steps. I didn't get that beep from my laptop. But I got the vibration when I hold the power button when it's not connected to USB. Please Help me.
Sorry my english isn't that good.