Bricked my Asus TF300T? Manual JB update First, my device failed to get the OTA Update because I deleted some system apps (see my original post).

Then I found this post where another user restored original APKs in /system/apps and managed to manually update to JB by downloading the dlpkgfile in this post.

So I proceed, restored my /system/apps (with 755 permissions), rooted with OTA RootKeeper and SuperSU, placed the dlpkgfile and command files, restarted to fastboot (Power+Vol Down) and entered Recovery mode.

The green android with the blue progress bar went for over 10 minutes, then ... the android with the RED TRIANGLE appeared 

After a minute or so the device restarted, an ASUS logo with a blue progress bar ran, but then it got stuck in the ASUS logo.

I'm still able to restart to fastboot (Power+Vol Down), where a message appears:

Android cardhu-user bootloader (1.00 e) released by "US_epad-10.4.2.9-20120809" A03


, and where I have 4 choices:


  
  RCK: Recovery mode, when I select this the Red Triangle appears again.
  Android: Normal android boot, gets freeze right away
  Fastboot USB download protocol: Tried using ADB, but don't really know what it is. Here's an image of how the device appear in my
  Windows PC  
  Wipe Data: Already done this, seems to wipe user data, but still gets stuck on ASUS logo
  


Some pictures I took of my device:  

I also tried downloading .30 firmware from ASUS website and placing the Zip contents in my SD card, then booting recovery but no luck.

It's pretty awful that everything went so bad, I'm hoping there is a solution.

Anything would be really appreciated!!!

Thanks!

UPDATE!!!

OK, I found this tutorial about flashing ASUS firmware with fastboot: http://www.theandroidsoul.com/how-to...back-to-stock/

The problem is that the following commands:

fastboot -i 0x0B05 flash system blob
fastboot -i 0x0B05 flash system US_epad-user-9.4.3.30.zip


both produce the error: "Signature mismatch"

I guess it's because my fastboot has newer version, since it was actually installed during the JB update, but I'm trying to flash a older .30 firmware.

I guess I will have to wait ASUS releases the new firmware for manual flashing it.

Just guessing...



More info here: http://forum.xda-developers.com/showthread.php?t=1846661
Solved. ASUS released the new firmware in its website.

Flashing it unbricked my device:


Download the stock firmware from ASUS’s official website. On the website, select Android in the OS drop down menu, then select Firmware, and download the latest firmware.
Extract the downloaded firmware file. You will get another archive file. Extract this one as well to get several files. One of these files will be named “blob”, which is the one we need to use.
Install Android SDK for Windows.
Shut down the tablet. Hold Power + Vol Down buttons until a message appears saying “Press Vol. Up to enter RCK (5s)”. However, DO NOT press the Volume Up button. Instead, wait for 5 seconds till a new menu appears. Then, in less than 10 seconds, press Volume Down once to highlight the USB icon, then press the Volume Up button to validate.
Open Command Prompt on your computer from Start » All Programs » Accessories (or open Start menu, type cmd and press the Enter button).
Now, type the following commands in command prompt to flash the stock ROM, pressing Enter after each command:

> cd C:...\Path-to-Andoid-SDK\platform-tools\

> fastboot devices

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

> fastboot -i 0x0B05 reboot


Source: http://www.theandroidsoul.com/how-to-restore-asus-transformer-tf300t-back-to-stock/

More details: http://forum.xda-developers.com/showthread.php?t=1846661