The one posted in the dev section for the one XL : http://forum.xda-developers.com/show....php?t=1550930
Then follow this setup (found here: http://forum.xda-developers.com/show....php?t=1609190
Originally Posted by torxx
So here a method which always works (many people have issues with flashing RUU's etc. having a bootlop.)
Open the .exe and make sure that it fully started.
Don't click anything, just go to windows icon and search for %temp%.
You will now find some folders, just search through these folders for the ROM.zip.
If you found it, you can copy it to your desktop or somewhere else.
Extract it with WinRar,7-zip or something like that and take the boot_signed.img and system.img.
Now copy the two files into the folder where the fastboot.exe is placed (if you have installed the Android SDK, it should be in platform-tools)
Plug in your One X, go into the bootloader and go into fastboot mode.
Navigate with the cmd in the folder with the fasboot.exe and the two .img's.
Now type in that:
fastboot flash boot boot_signed.img
fastboot flash system system.img
If everything worked, just reboot: