Bricked unlocked TF201 ? Stuck on teamwin screen - Asus Eee Pad Transformer Prime

Hello
I wanted to speed up the TF201 with the help of the Kernel Adjutor. Something went wrong and after a series of frustrated attempts the only thing I get after starting the TF 201 are
- the ASUS /nvidia screen with the message "the device is unlocked"
- 4 penguins with a text "3.xxxxx message length: 9" (xxxxx being random numbers)
- the blue "teamwin" screen.
I cannot get into any other screen by pressing the volume up or down.
In June 2017 I have installed KatKiss 7.1 v023 following your tutorial. I have also made the backup recommended there.
How do I have to proceed to get the TF201 back to normal ?
Thank you very much for your help.
SwissJames

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You might have to bring it back using a PC/Laptop along with Minimal ADB and Fastboot, you would have to wipe it and in the process loss everything.
Is your back-up on an external media like the micro SD or SD card?
NP

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Hello Nektopoli
Thanks for your support.
backup files "bricksafe.img", "factory-config.img" and "unlock-token.img" are on the PC.
I still have the original files on micro SD from the upgrade to Android 7.1 Nougat as described in the tutorial.
After much research and many unsuccessful tries, it seems that I get lucky with lj50036's post: https://forum.xda-developers.com/showthread.php?t=2538028. After following his instructions it I was able to boot into fastboot.
At the step "fastboot -w" I got stuck: erasing cache "Command write failed <unknown error>"
So I closed the terminal and opened a new one (as described).
"fastboot erase boot" failed again "Command write failed <unknown error>"
Restarting the PC fixed the issue.
I managed to get the other steps done as well.
Now the tablet is working again with Android 4.1.1.
Next I'll upgrade it back to 7.1
Regards
SwissJames

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swissjames said:
Hello Nektopoli
Thanks for your support.
backup files "bricksafe.img", "factory-config.img" and "unlock-token.img" are on the PC.
I still have the original files on micro SD from the upgrade to Android 7.1 Nougat as described in the tutorial.
After much research and many unsuccessful tries, it seems that I get lucky with lj50036's post: https://forum.xda-developers.com/showthread.php?t=2538028. After following his instructions it I was able to boot into fastboot.
At the step "fastboot -w" I got stuck: erasing cache "Command write failed <unknown error>"
So I closed the terminal and opened a new one (as described).
"fastboot erase boot" failed again "Command write failed <unknown error>"
Restarting the PC fixed the issue.
I managed to get the other steps done as well.
Now the tablet is working again with Android 4.1.1.
Next I'll upgrade it back to 7.1
Regards
SwissJames
Click to expand...
Click to collapse
Have you updated the bootloader to 10.6.1.27.1 and installed the TWRP recovery console?
NP

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No, not yet. As I flashed the tab with the official ASUS firmware, everything has gone. Bootloader is 10.4.2.18 and the TWRP recovery console is gone. (RCK ends up with a "dead" android...). I'll follow the latest version of the tutorial https://forum.xda-developers.com/tr...uide-tutorial-asus-transformer-prime-t3486237 to upgrade the tab.

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Can you access the tablet via a computer/laptop using and ADB fastboot program like "Minimal ADB and Fastboot" https://forum.xda-developers.com/showthread.php?t=2317790
If you can, you could manually wipe the tablet, and flash JB Bootloader 10.6.1.27.1 and TWRP 2.5, then update the TWRP and install 7.1
NP

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I almost got through the guide till chapter 8. Trying to install the open_gaaps-arm 7.1 pico I got the error msg "insufficient storage space available in System partition". The error log is attached.
Maybe you have an idea what I could delete on the System partition (and how). I have tried e.g. to get rid of the gmail account, but without success.

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You should wipe the system partition before flashing the ROM, SuperSU and GAPPs using TWRP when you flash a new ROM
Alternatively, if you're using a PC and Fastboot to install the ROM
the: [fastboot erase system] command will wipe the system, but I don't think it will change the System partition to F2FS
NP

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I have wiped all partitions before proceeding.
The size of my "system" partition after wiping is 503 MB (8 MB used) with ext4 (510 / 116 MB used with f2f). So I opted for the ext4-variant as described in the guide.
After installing KatKiss-7.1_TF201_026.zip, 433 MB are used in "system"
After installing SuperSU-v2.82.zip, 440 MB are used in "system".
So there is not enough space left for open_gaaps-arm-7.1_pico.zip with about 125 MB unzipped.
Is there a way to increase the size of the "system" partition ? (there is enough space left in the "data" partition where I could take some...)
Or do you see other options ?

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Can you get back into the recovery console?
NP

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yes I think so.
By pressing power and volume - I got to the selection screen and chose RCK. Now I am in TWRP again.

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When you boot into the fastboot screen, the one with the RCK icon you should see the bootloader version at the top of the screen, what version is your tablet on?
this is what mine looks like
NP

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it says
<1.00 e> released by "ww_epad-10.4.2.15-20120917" A03
sj

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I checked the configuration of the bootloader before I began with the upgrade from 4.1. It said 10.4.2.18-20112122...
sj

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What version TWRP do you have working now?
Ok, with the working TWRP you can flash the new Bootloader v10.6.1.21.1 found here;
https://androidfilehost.com/?fid=23060877490002899
This will also install TWRP 2.5 at this point we don't want to install any thing else. Once you are on the correct bootloader and TWRP 2.5 you will need to update TWRP in two steps. First to TWRP 2.8.5.1 and then to TWRP 3.1.0-1 once you have a working TWRP you can wipe the TF and flash the 7.1.2 ROM.
NP

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As you suggested I downloaded the zipped file and put it on the pc and on the sd-card.
Swiped it with the twrp 3.1.0-1 from the sd-card
looked ok. Requested reboot.
The blue line appeared. It took no time at all to complete.
Now the I am on the asus-screen
reboot to get to see the version. still 10.4.2.15 with twrp 3.1.0-1
next try: installing the bootloader with cmd.exe
typed on pc: "adb devices"
response:
"list of devices attached"
"015d0787774bf603 recovery"
typed: "adb push nHairyBean_Bootloader_TWRP2.5.zip /sdcard" (the one I got from the site you indicated)
response: "1325 KB/s" etc -> looks as transferred to sdcard
on tab: "installing files.."
"done..."
"now please restart..."
"updating partition details..."
"...done"
reboot to get to see the version.
screen says
"OS will cold boot in 10 seconds if no input is detected"
"booting recovery kernel image"
Version is still 10.4.2.15 with twrp 3.1.0-1

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That is so bizarre that it wont update the bootloader or downgrade the TWRP.
One way to fix this is to do a FULL "adb wipe"
fastboot erase system
fastboot erase recovery
fastboot erase userdata
fastboot erase boot
fastboot erase misc
fastboot erase cache
This will wipe the complete table back to nothing.
Then:> adb push nHairyBean_Bootloader_TWRP2.5.zip /sdcard
This should get you on the correct bootloader and TWRP, after this boot into fastboot to confirm you're on the correct bootloader then flash 3.1.0-1
NP

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I did what you suggested and erased all the files ->worked well.
Then "adb push nHairyBean_Bootloader_TWRP2.5.zip /sdcard" -> got an error: "device not found"
I restarted the tab and then clicked on the USB-symbol.
"adb devices" showed an empty list of devices attached.
"fastboot -i 0x0b05 flash recovery flatline_TF201.img" gave "OKAY" and "writing recovery"
Bootloader is still 10.4.2.15
On the tab I am now on Flatline CWM Recovery v1.0RC1
TWRP is gone.
"adb devices" shows "0123456789ABCDEF recovery"
again "adb push nHairyBean_Bootloader_TWRP2.5.zip /sdcard" success ! Data were copied.
reboot. Bootloader is still on 10.4.2.15
nBootloader should now be in the /sdcard
next intent:
"fastboot -i 0x0b05 flash recovery flatline_TF201.img" gave "OKAY" and "writing recovery"
restart, then to RCK - flatline CWM recovery
install zip from sdcard -> no files found
got in advanced - wheelie - I accept the above statement - flash androidRoot BL power off
-> blue progress line is almost empty. then progress line disappears, ASUS screen shows up.
In Flatline recovery tried "install zip from sdcard" - "choose zip from sdcard".
only "- AndroidRoot/" is shown. (no nHairyBean_Bootloader_TWRP2.5.zip). So no way of installing the nHairyBean_Bootloader-
On one hand, it seems that I am able to establish a connection between the PC and the tab when in RCK, but when in USB, the connection seems not possible.
Hmmm...
Maybe I am missing something basic in this whole thing that keeps me from progressing.
What if I use the backup-files and try to go back to the initial configuration of the TF201 ? Or are there other options with the CWM-Recovery ?
Regards sj

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That sounds like the best idea, going back to the stock ROM, they can be found here; https://www.asus.com/Tablets/Eee_Pad_Transformer_Prime_TF201/HelpDesk_Download/
Download the version for you region install and see if you can get back to stock.
NP

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I downloaded the file you indicated. Now how do I get it into use ?
I cannot get into APX-mode
the only program working in the tab seems to be the flatline CWM Recovery v1.0RC1.
I tried to send the zip-file with "adb sideload <filename>" Error: failed to write data 'protocol fault <no status>'
I copied the zip-file to the external sd-card, but do not see how I can access it. The sd-card mentioned on screen ("Apply update from .zip file on SD card")seems to be an internal storage.