Originally Posted by AndroHero
You need to post you CID and bootloader version before anyone can help you.
Sent from my HTC One X+ using Tapatalk
Due to the urgency, I already found someone, who was able to help me
For everybody else who need a Solution:
1. First of all, you should find out your CID (which indentifies the Branding and the country) and your Bootloader Version.
To find out CID:
Switch into bootloader, connect to PC, use fastbootcommand "fastboot oem readcid"
To find out version:
Switch into bootloader, connect to PC, use fastbootcommand "fastboot oem version-main"
2. GET THE CORRECT RUU!
There is something called "RUU" which stands for "Rom Upgrade Utility".
It will bring you device COMPLETELY(Rom -> Kernel, Recovery,) back to Stock!
WARNING: ALL DATA WILL BE ERASED!
There's an easier way to get the build version.
In your Phone: Preferences - System - Software - More Information and read the Build Version.
IN MY CASE the build version readed by the fastboot command was different to that shown in my preferences on the phone!
IN THIS CASE CHOOSE THE FASTBOOT ONE!
3. LOCK YOUR BOOTLOADER!
This is something I havent understood yet.. Anyway, it works
To do this:
Switch into bootloader, connect to PC, use fastbootcommand "fastboot oem lock"
4. RUN THE RUU (.exe) AND FOLLOW INSTRUCTIONS
Thanks to everyone