[Asus  Eee Pad Transformer Prime] vanquishe:
Please thank lj50036 from the CMB team.

It was him that guided me thru the process to unbrick my TP.

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Bricked situation:

1. Last activity before brick: Stock with latest OTA -> Flatline (OK) -> Motochopper (OK) -> Flash CWM recovery (OK) -> Unofficial CM11 (Reboot = bricked)

2. Stuck at ASUS logo on power up/reboot. (Device is unlocked no longer shows on top left corner)

3. Cannot get to fastboot (power + dwn = stuck at ASUS logo)

4. However, can invoke APX mode (power + up = APX device detects in windows)

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Preparation:

1. All the output files from the flatline (blob.bin, unlock-token, bricksafe, factory-config etc)

2. Fastboot,adb,nvflash exe (you should have all these when you did flatline)

3. Enough battery (I left it overnight to charge, since I had no way of checking batt)

4. The stock firmware from ASUS (you should get the same version as the one you had prior to brick)

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Actual process:

1. I was told to put all the files from fastboot,nvflash etc in C root (ie .exe,.img,.dlls, bin etc). I think it is not a must, as long as you have all the files together and dir has no spaces.

2. Unzip the firmware file from ASUS.

My case: the file name is JP_epaduser_10_4_2_18UpdateLauncher, extracted to find JP_epad-user-10.4.2.18. Extract again to find a file called Blob, which is about 500mb.

3. Copy the blob file to C root

4. Open CMD as admin. Make sure you do so as admin.

5. Goto C root, type: cd\

6. Just make sure you can execute the following exe: fastboot, adb, nvflash, type: fastboot

The commands should output the help related info....ie parameters etc

7. Now boot you tablet into apx conneted to your pc from tablet to pc no hubs docks> Device manager shows Asus tranformer prime APX interface.

8. Type: wheelie --blob blob.bin

My output:

C:\>wheelie --blob blob.bin

Wheelie 0.1 - Preflight for nvflash.

Copyright (c) 2011-2012 androidroot.mobi

========================================

Waiting for device in APX mode...

[=] Chip UID: 0x15c7d7a49042111

[=] RCM Version: 0x30001

[=] CPU Model: Tegra 3

[+] Sending bootloader...

Sending file: 100 %

[!] Done - your device should now be ready for nvflash

My tablet screen shows:

top left: entering nvflash recovering mode / nv3p server

chip uid: 015c7d7a49042111

center: Asus

bottom right :powr by...

9. Now it may reboot at the end of this just get back to apx mode on your tablet.

Type: nvflash -r --download 7 unlock-token.img

Output:

C:\>nvflash -r --download 7 unlock-token.img

Nvflash v1.13.87205 started

[resume mode]

sending file: unlock-token.img

unlock-token.img sent successfully

*My device black out. So i rebooted to APX again as instructed.

10. Type: wheelie --blob blob.bin

11. Type: nvflash -r --download 14 factory-config.img

Output:

C:\>nvflash -r --download 14 factory-config.img

Nvflash v1.13.87205 started

[resume mode]

sending file: factory-config.img

factory-config.img sent successfully

*My device black out. So i rebooted to APX again as instructed. An did wheelie again

12. Type: nvflash -r --rawdevicewrite 0 2944 bricksafe.img

Output:

C:\>nvflash -r --rawdevicewrite 0 2944 bricksafe.img

Nvflash v1.13.87205 started

[resume mode]

sending file: bricksafe.img

bricksafe.img sent successfully

*device did not blackout this time. So no need to reboot.

13. Type: nvflash -r --go

Output:

C:\>nvflash -r --go

Nvflash v1.13.87205 started

[resume mode]

14. Power + DWN to try to get to fastboot. Select the USB icon.

*windows device manager should detect fast boot interface

*confirm this by typing: fastboot devices

*my output was: 015c7d7a49042111 fastboot

15. Type: fastboot erase system

Output:

C:\>fastboot erase system

******** Did you mean to fastboot format this partition?

erasing 'system'...

OKAY [ 2.671s]

finished. total time: 2.671s

16. Type: fastboot erase recovery

Output:

C:\>fastboot erase recovery

erasing 'recovery'...

OKAY [ 1.929s]

finished. total time: 1.929s

17. Type: fastboot -w

Output:

C:\>fastboot -w

erasing 'userdata'...

OKAY [ 50.110s]

formatting 'userdata' partition...

Creating filesystem with parameters:

Size: 61980278784

Block size: 4096

Blocks per group: 32768

Inodes per group: 8192

Inode size: 256

Journal blocks: 32768

Label:

Blocks: 15131904

Block groups: 462

Reserved block group size: 1024

Created filesystem with 11/3784704 inodes and 283616/15131904 blocks

sending 'userdata' (141195 KB)...

Created filesystem with 11/3784704 inodes and 283616/15131904 blocks

sending 'userdata' (141195 KB)...

writing 'userdata'...

OKAY [ 26.179s]

FAILED (command write failed (Unknown error))

finished. total time: 76.878s

*dont be bothered by the error

18. Type: fastboot devices

Output:

C:\>fastboot devices

???????????? fastboot

19. Reboot and get back to fastboot again, check that your device is detected by Type: fastboot devices

Output:

C:\>fastboot devices

015c7d7a49042111 fastboot

20.fastboot erase boot

Output:

C:\>fastboot erase boot

erasing 'boot'...

OKAY [ 1.874s]

finished. total time: 1.874s

21.Type: fastboot erase misc

Output:

C:\>fastboot erase misc

erasing 'misc'...

OKAY [ 0.978s]

finished. total time: 0.978s

22. Type: fastboot erase cache

Output:

C:\>fastboot erase cache

******** Did you mean to fastboot format this partition?

erasing 'cache'...

OKAY [ 1.713s]

finished. total time: 1.713s

23. Next cmd takes long time. Type: fastboot -i 0x0B05 flash system blob

* During the writing process of this step you will get the blue bar on your screen.....

Output:

C:\>fastboot -i 0x0B05 flash system blob

erasing 'system'...

OKAY [ 2.225s]

sending 'system' (537604 KB)...

OKAY [ 90.363s]

writing 'system'...

OKAY [130.010s]

finished. total time: 222.600s

24. Type: fastboot -i 0x0B05 reboot

*this reboot should bring you to stock rom

*will take some time, just be patient

*does not matter if you have usb connected or not

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If you reach here, you should have a fresh TP with stock, except its unlocked.

Hope this helps.