[Asus  Eee Pad Transformer Prime] shatterstar78:
I can't tank you enough for your help in pointing me in the right direction. I'm now back up and running:good: The first guide got me close, but did not fully unbrick, so I got creative. I will list the steps I took to maybe help others out.

1. First you need Fastboot get it here(http://matthill.eu/content/downloads/transformerprime-unlock/fastboot.zip)

1b. You will need the Universal_Naked_Driver found here (http://matthill.eu/content/downloads/transformerprime-unlock/Universal_Naked_Driver_0.72.zip)

1c. Unzip the drivers somewhere, if at any point during this guide Windows detects your tablet as an unknown device, point it to this location for the drivers.

2. Unzip fastboot.zip somewhere preferably in C:\ (I found that folder names with spaces can cause problems)

3. Download the official update for your device from Asus. Make sure you get the right one, US, EU, WW, etc.

4. Unzip the update twice so that way you have a blob file.

5. Place the blob file into your fastboot folder.

6. Open a command prompt and navigate to your fastboot folder and enter the fallowing commands.

fastboot erase system

fastboot erase recovery

fastboot erase userdata

fastboot erase boot

fastboot erase misc

fastboot erase cache

This next command will take the longest. Also you will notice the green RCK icon will stop flashing and you will have a blue progress bar, This is normal. Do not run the last command(reboot) until the green RCK logo starts flashing again and the blue progress bar is full.

fastboot -i 0x0B05 flash system c:\fastboot\blob (your path may vary depending where you placed the fastboot folder)

Now that all is done run the last command.

fastboot -i 0x0B05 reboot

If you are back up and running congratulations you are unbricked, but if you are stuck at the white Asus logo follow the next additional steps. Only do this if you are not fully booting up after the first part of this guide.

1. You will need a microsd card(32G max) and has to be formatted to Fat32.

2. Next you are going to take the Asus update you downloaded above, and unzip it

ONLY ONCE

and rename it to EP201_SDUPDATE.zip

3. Place the newly renamed EP201_SDUPDATE.zip on your sdcard, make sure its on the root directory and not in a folder.

4. Now reboot to fastboot (Hold Power and Volume Down) Press Volume Up when the white text at the top appears.

5. When the fastboot menu comes up with RCK icon selected press Volume up.

6. Go have a beer, this will take some time. Do not touch anything, when it is done the Asus configuration wizard will be displayed.

7. Congratulations you are now hopefully fully unbricked.

Some Tips:

1. Make sure you have "Show File Extensions" enabled in Windows, if not then when you rename the update to "EP201_SDUPDATE.zip" it will actually be "EP201_SDUPDATE.zip.zip".

2. Use Windows 7 if possible, Windows 8 just causes problems.

3. Disable Windows UAC or run fastboot as administrator.

4. Use a stock OEM data cable.

5. Make sure you have a fully charged tablet, cant stress this enough if your battery dies during this process, then you are in some serious trouble.

Credit goes to Buster99 for discovering the first part of this guide.