"Key Driver Not Found.. " on Bootloader 4.2.1 - Transformer TF300T Q&A, Help & Troubleshooting

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 .

Related

[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.

[Q] Stuck at bootlogo

Hi,
I got this tablet from a friend, and it's stuck at the boot logo. I've tried hard reset, reset via recovery, nothing seems to work.
How can I flash the latest official rom?
Can't seem to find a tool for it, and Asus suggest to flash with the tablet itself, but that's not possible for now.
Anyone?
Thx!
http://forum.xda-developers.com/showthread.php?t=1688012
Easyflasher to flash TWRP recovery > copy ROM to MicroSD card, flash ROM
Thanks! I can't seem to get him into APX mode, what is the exact procedure?
Connect the tab to USB > PC first
Power Off the Tab
Hold Volume Up & Power
Nothing will appear on the Tab screen, but the PC should sound the USB connect noise / device manager will show it has connected - only takes a few seconds to enter APX mode
I've tried that, doesn't seem to recognize it . Would you help me via IM of some sort?
It`ll be the drivers most likely, open device manager when its connected and in APX mode, and manually update the drivers using the Universal Naked Driver from the Easyflasher site
I don't have any IM installed unfortunately but I`ll help you out here
Ok, that would be wonderful. The problem is, I don't know when it's off. I can't get it to shut down, it keeps rebooting. I'm monitoring dev manager with sound high, but it's not coming up. Cable is working, because it will charge. Using the original cable. (Windows 7 x64)
Best thing to do would be connect it to the PC, then press and hold Power until it shuts off, then try for APX mode - you might even be able to enter APX from a powered on state by holding the same button combo, but Ive not tested that myself
And a cable that charges doesn't automatically mean it will work for Data, they use different pins, some for power and some for data, if the data pins are damaged, it will still charge
I can't seem to get it working . Any other ways to flash it?
Not without being able to get it to boot - you'll need APX mode to do anything in the state it's in now
A bad cable is a common problem though, might be worth grabbing another one from eBay
To bad. I'll try and let it drain till it's empty, and fully charge it then. Just ordered another cable.
Thx for the help!
If the System / Data partitions are corrupted, which generally causes the boot loop, then draining and recharging won't help
Plus be careful not to drain the battery to 0%, their design prevents them from recharging if they hit 0% - many people have had to buy new batteries after not using their tab for a few months and letting it drain completely
Good luck, so long as there is no hardware damage, once you have a working cable it should be pretty straight forward to get TWRP recovery and a new ROM flashed to it
Might be worth trying your current cable on another PC too
Thanks for the headsup! Will try!
Hello everyone,
Not to thread jack but I have a similar problem and instead of opening a new thread I decided to revive this one.
I have a similar problem that my TF101 has been working flawlessly for many years. It is rooted and was running 4.3 ROM. As of a couple of days ago it just won't boot at all. It has been stuck at the NVidia screen and just sits there. I tried to enter recovery mode by using volume(-) + power and the unit presents the TEAMWIN logo and just loops as well by showing the TWRP screen (3 seconds) then going blank for a second then showing TWRP screen again in a cycle.
I downloaded and tried Easyflasher and Brks toolkit and nothing can complete the flash. Tried different installed drivers as well. I can enter MTP mode which the computer can see the device but the manufacturer name and model are not-recognized. I can also enter APX mode but while trying to flash anything I get an error message (error, cannot flash bootloader) and the computer dings (device disconnects).
I have been trying for a days now and have run out of ideas.
Has the unit finally bit the dust? Does any one out there have any more ideas or suggestions on what to try next?
TIA for any help provided.
Anyone with any sort of help on my previous post? Time to retire it for real this time?
TIA
Sent from my VisionX powered SM-N900T.
Jayster0966 said:
Anyone with any sort of help on my previous post? Time to retire it for real this time?
TIA
Sent from my VisionX powered SM-N900T.
Click to expand...
Click to collapse
Have you tried a different / new cable in-case that's the reason all the flashing attempts and computer recognising the unit are failing ?

Reboot loop/reboots no matter what

I have searched and have read many of the posts relating to reboot issues. However my problem is a bit harder to fix.
My device constantly turns off then on, never passing "EEE pad" screen.
I can turn off the tablet using power+volup, and I can get white text, and menu with two options via power+voldown.
However choosing either option just does nothing, the tablet simply reboots and continues boot loop.
I have tried placing stock rom on sdcard and booting, still this does nothing.
I have tried APX mode, however I can not get APX mode to turn on at all. I have insured tablet is off, and I it connected via usb cable (one that has worked before), I use the power+volup command, however nothing new shows up in device manager.
and yes "cold booting" does cause the device to just turn off and resume boot loop.
There is a pop or click when ever the device turns itself off.
Use Easyflasher to install TWRP recovery (See my sig for links)
Then flash KatKiss #33 if you want a nice fast stable ROM, again, see my sig
Use a 32bit version of windows for installing the APX drivers from the Easyflasher thread
Easyflasher will not work, because as stated my device is not seen by the computer. As in there are NO hardware changes in device manager when trying APX mode. No unknown devices, APX is greyed out, and TF101 is greyed out with no changes.
ok, something new to report.
I took it apart, to see if there was some issue, found none, put it back together and now it starts fine.
I have NO idea why, but my problem seems solved.
arolust said:
ok, something new to report.
I took it apart, to see if there was some issue, found none, put it back together and now it starts fine.
I have NO idea why, but my problem seems solved.
Click to expand...
Click to collapse
congrats. I give you and A for perseverance.

[Q] Hard-Bricked, no boot. Failed during flash

OK,
I was trying to flash a new ROM and had some issues where it would continously reboot so, after some reading it seemed like I needed a new version of TWRP, so I updated it. That didn't help.
I decided to reflash the stock rom on the device but after doing that, it wouldn't boot past the ASUS boot screen. So I tried again (via fastboot), same result. So I tried again and this time fastboot crashed in the middle of the load and now the tablet won't boot or anything.
It seems like the tablet still has power because windows makes a funky sound when you plug it in.
I saw this post but pressing the tiny button with a paperclip doesn't do anything.
Edit:
Windows can tell I plugged something in but says there is an error and doesn't recognize it anymore. Therefore, I don't have adb or fastboot access.
Edit: I installed the naked drivers and got it to recognize the device as an apx. I then pointed it to the normal driver and is recognizes it as an adb device but I can't connect via adb.
Edit: Nevermind, it came unplugged and when I plugged it in again windows didn't recognize it.
Where in the crap do I go from here?
gtgeek said:
OK,
I was trying to flash a new ROM and had some issues where it would continously reboot so, after some reading it seemed like I needed a new version of TWRP, so I updated it. That didn't help.
I decided to reflash the stock rom on the device but after doing that, it wouldn't boot past the ASUS boot screen. So I tried again (via fastboot), same result. So I tried again and this time fastboot crashed in the middle of the load and now the tablet won't boot or anything.
It seems like the tablet still has power because windows makes a funky sound when you plug it in.
I saw this post but pressing the tiny button with a paperclip doesn't do anything.
Edit:
Windows can tell I plugged something in but says there is an error and doesn't recognize it anymore. Therefore, I don't have adb or fastboot access.
Edit: I installed the naked drivers and got it to recognize the device as an apx. I then pointed it to the normal driver and is recognizes it as an adb device but I can't connect via adb.
Edit: Nevermind, it came unplugged and when I plugged it in again windows didn't recognize it.
Where in the crap do I go from here?
Click to expand...
Click to collapse
+1
gtgeek said:
OK,
I was trying to flash a new ROM and had some issues where it would continously reboot so, after some reading it seemed like I needed a new version of TWRP, so I updated it. That didn't help.
I decided to reflash the stock rom on the device but after doing that, it wouldn't boot past the ASUS boot screen. So I tried again (via fastboot), same result. So I tried again and this time fastboot crashed in the middle of the load and now the tablet won't boot or anything.
It seems like the tablet still has power because windows makes a funky sound when you plug it in.
I saw this post but pressing the tiny button with a paperclip doesn't do anything.
Edit:
Windows can tell I plugged something in but says there is an error and doesn't recognize it anymore. Therefore, I don't have adb or fastboot access.
Edit: I installed the naked drivers and got it to recognize the device as an apx. I then pointed it to the normal driver and is recognizes it as an adb device but I can't connect via adb.
Edit: Nevermind, it came unplugged and when I plugged it in again windows didn't recognize it.
Where in the crap do I go from here?
Click to expand...
Click to collapse
So will the tablet not boot into the bootloader ?
Thx Josh
lj50036 said:
So will the tablet not boot into the bootloader ?
Thx Josh
Click to expand...
Click to collapse
Nothing, just the black screen.
I only know something is going on when I connect it to a pc I can here it connect/disconnect when I hold the power button or press the reset button. Also checked the hdmi output on another screen to make sure that wasn't the problem....it wasn't.
gtgeek said:
Nothing, just the black screen.
I only know something is going on when I connect it to a pc I can here it connect/disconnect when I hold the power button or press the reset button. Also checked the hdmi output on another screen to make sure that wasn't the problem....it wasn't.
Click to expand...
Click to collapse
I see....
If you dont have your nvflash blobs, its a brick ...
Sorry for the bad news ....
Thx Josh
lj50036 said:
I see....
If you dont have your nvflash blobs, its a brick ...
Sorry for the bad news ....
Thx Josh
Click to expand...
Click to collapse
That was the conclusion I was coming to.
Now, for a nerdier question. If I had physical access to the processor, could I program it directly using it's programming ports?
gtgeek said:
That was the conclusion I was coming to.
Now, for a nerdier question. If I had physical access to the processor, could I program it directly using it's programming ports?
Click to expand...
Click to collapse
Nope there is just no way...
The chip is locked down ... :crying:
There is lots of info out there but its just info ...
No one to date has come back from where you are ....
Thx Josh

I think my Pixel 2 is bricked!

So here is what happened, I installed TWRP on my device and completely wiped my phone so I can install bootleggers OS and Gapps on my Pixel 2 Walleye. But I accidentally booted into Boot slot B on twrp and now the only thing the device can boot into is the bootloader mode, recovery and download mode is completely useless, It gives me either operation denied error or Error slot unbootable. The worst part is no computer will recognize my pixel in device manager at all. Mac computer will not detect it either. Ant tips on how to fix this? And again my I have all drivers installed and platform tools are up to date. And devices bootloader is unlocked.
Anything helps!
RomBetaTester said:
So here is what happened, I installed TWRP on my device and completely wiped my phone so I can install bootleggers OS and Gapps on my Pixel 2 Walleye. But I accidentally booted into Boot slot B on twrp and now the only thing the device can boot into is the bootloader mode, recovery and download mode is completely useless, It gives me either operation denied error or Error slot unbootable. The worst part is no computer will recognize my pixel in device manager at all. Mac computer will not detect it either. Ant tips on how to fix this? And again my I have all drivers installed and platform tools are up to date. And devices bootloader is unlocked.
Anything helps!
Click to expand...
Click to collapse
Did you use the same USB cable each time? If yes try different ones, even if it seems to work with other devices. On your PC go to device manager, then view and then hidden devices. Remove anything that has to do with Android. Then try connecting your device. Does an andriod driver show up after you've connected your device?
I have tried 3 different cables. But will try another one
RomBetaTester said:
I have tried 3 different cables. But will try another one
Click to expand...
Click to collapse
Did you go to view, hidden files in device manager and delete all Android drivers? And if you did, did anything show up after connecting your device?
I am having a similar issue after trying to flash the March update. During the script, the System image failed to transfer completely. I tried again using deuce flash all script, and it got a little further (4/5) with the System image but ultimately failed. Things got worse when my computer stopped recognizing the phone. Now I can't even try anything else because there is no communication, similar to OP. I have tried three different computers, three different cables, and have tried deleting Android related drivers in the device manager. No luck, unfortunately. I tried installing USB drivers from Google which also did not help. I welcome any other ideas of what to try next and appreciate any help.
EDIT: I solved the problem by draining the battery completely. In order to drain the battery, I first left the barcode screen on until eventually just the battery image is displayed on-screen when pressing power. Then eventually there will not be enough power to light up the screen at all, but the LED indicator will blink red while holding the power button. Now, I set up my phone such that the power button was held pressed down and left it there until the LED stopped blinking. Now that the power is completely drained, I could successfully get my computer to recognize it! I followed the steps in this post:
https://forum.xda-developers.com/showpost.php?p=78726736&postcount=13
EDIT2: I should also note that the system image didn't flash successfully the first time and I had repeat step 12 which is flashing the update. Luckily it worked the second time!
I had something similar happen. Held down power for about 10 seconds or so until the phone vibrated, then it was recognised by the computer. Then flash stock image
https://forum.xda-developers.com/showpost.php?p=78744315&postcount=31
ricky56789 said:
I had something similar happen. Held down power for about 10 seconds or so until the phone vibrated, then it was recognised by the computer. Then flash stock image
https://forum.xda-developers.com/showpost.php?p=78744315&postcount=31
Click to expand...
Click to collapse
Man you just saved me =)

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