Know how to restore Asus Tranformer pad TF300TL tablet from unrecoverable bootloader error 0x00000000 soft brick code error.

Asus Tranformer Pad TF300TL software brick + Unrecoverable bootloader error 0x00000000

Hello, I had two problems with my tablet model Asus Tranformer Pad TF300TL, sku: us. I installed the Firmware version: v10.6.2.4 for ww sku and manually upgraded.

I wanted to test the stability improvements and operation of the battery according to official new firmware update description. But i used an erroneous recovery version of CWM for JB and  i think I got a soft brick caused by wrong file install. 

fastboot -i 0x0B05 flash recovery recovery.img         instead of using:
fastboot -i 0x0B05 flash recovery recovery-jb.img   

When i turn on tablet, goes straight to recovery, even after have tried rebooting into system, i followed the button combinations to boot into RCK. The version installed of CWM was based in Recovery v6.0.2.3 occurs that after opening CWM immediately below error messages are displayed.

E:Can’t mount /cache/recovery/command
E:Can’t mount /cache/recovery/log
E:Can’t open /cache/recovery/log
E:Can’t mount /cache/recovery/last_log
E:Can’t open /cache/recovery/last_log

And now can’t  grab any rom in SD card when I’m forced into recovery. I tried with two kind of SD, 1Gb Sandisk, 4Gb Kingston HC-(4). when I try to mount any partition like /data and /sdcard from “mounts and storage” obtain:
Error mounting /sdcard!, Error mounting /sdcard!, Error mounting /emmc!

Also i download android tools and installed adb universal drivers, from recovery mode, If I type "adb devices" shows a proper reorganization.

List of device attached
0123456789ABCDEF    recovery

So every time when start up, even without hitting vol+power key, it goes into the recovery mode, only can start up SO if i use “adb reboot-bootloader”  and hit Android icon. RCK and Wipe Data icons don’t work.

The Device is Unlocked.
Android cardhu-user bootloader <1.00 e> released by ww_epad-10.6.2.4-20130423” A03
Starting Fastboot USB download protocol

When I type fastboot devices at this point obtain:
015d2ebe8463f417       fastboot

Then it freezes when I trying for example, some of these code lines having all necessary files within  /android-sdk folder using it as administrator from Win 7. All drivers are properly installed. CWM 6.0.2.3 haven't been able to remove to install the TWRP.

fastboot -i 0x0B05 flash recovery recovery.img
fastboot -i 0x0B05 flash recovery recovery-jb.img:
fastboot -i 0x0B05 flash recovery twrp.blob

shortly before hanging icons screen:
Sending recovery
OKAY 2.398s
Writing recovery
OKAY 2.427s
Finished total time 4



After all, i recovered the first error from fastboot using command...

fastboot erase recovery

and second solved,  following some steps by: Buster99 dev user.

unrecoverable bootloader error 0x00000000    (red color message)


Solution:   

Reset your device using a paperclip/needle (about 2 cm down of your sdcard slot) and hold vol-down to enter fastboot. Now go to your descompresed fastboot folder and put the appropriate blob file within it. I'm use blop that corresponding 4.2.1 JB original firmware for TF300TL Asus Tranformer Pad, sku: ww. Open terminal how root and change to the directory that containing the  fastboot file. Test driver for your PAD and if it recognizes the device.
HTML Code:
fastboot devices 
fastboot erase system
fastboot erase recovery
fastboot erase userdata
fastboot erase boot
fastboot erase misc
fastboot erase cache
fastboot -i 0x0B05 flash system C:\android-sdk\blob
fastboot -i 0x0B05 reboot



Good luck & be happy.