How To Root HTC One X from AT&T - Ice Cream Sandwich

If you want to unlock the bootloader for installing custom roms and mods, you must go directly to the HTC Development page, register, choose your device model and follow on-screen instructions. is's safer than any other method on supported devices.

Instructios for rooting HTC One X AT&T - ICS (Original Build 1.85)

1. Download and install the HTC mobile phone drivers for Windows
2. Download the root_att_one_x.zip file.
3. Extract the root_att_one_x.zip file into a folder on your computer.
4. Plug your HTC One X into an USB port on the back of your computer, if you use a desktop PC.
5. Enable USB Debugging on your HTC One X.
   • Settings >> Developer Options >>USB debugging (checked)
6. Place the phone in Charge Only mode.
   • Pull down notifications bar, click on USB connection type, and switch to “Charge only.”
7. Go to the folder where you extracted the file root_att_one_x.zip, and double click root.bat to run the script. (Windows)
   • Linux users: double click root-linux.sh.
   • Mac users: double click root-mac.sh.
8. Now begins the root process.  DON'T TOUCH THE DEVICE OR UNPLUG WHILE ROOTING!
9. Device will reboot several times, so just WAIT! 
10. Congratulations! you have full root access.

Instructios for rooting HTC One X AT&T - ICS 4.0.4 (Build 2.20) - ADVANCED

1. Download and install the HTC mobile phone drivers for Windows
2. Download the X_Factor_Windows.zip file. if you are on a Mac or Linux download this one X_Factor_Linux_OSX.zip
3. Extract the X_Factor_Windows.zip file into a folder on your computer.
4. Plug your HTC One X into an USB port on the back of your computer, if you use a desktop PC.
5. Enable USB Debugging on your HTC One X.    -  Settings >> Developer Options >>USB debugging (checked)
6. Place the phone in Charge Only mode.    -  Pull down notifications bar, click on USB connection type, and switch to “Charge only.”
7. Go to the folder where you extracted the files and double-click "run.bat", or if running Linux or OSX, open a terminal, change folder to the extracted files, and run "./run.sh". DON'T TOUCH THE DEVICE OR UNPLUG WHILE ROOTING!
8. Follow the instructions printed by the exploit. You will need to authorize two backup restorations during the exploit's execution.
9. If the exploit is successful, it will print "[+] Set CID!". If it does not print this, the exploit has failed, so please do not continue.
10. The exploit will automatically reboot into bootloader mode. Press enter after bootloader mode is finished booting, and the exploit will print your CID. If the exploit was successful, it should return "11111111" as your CID.
11. If your CID was successfully set, press enter to generate an unlock token.
12. Visit htcdev.com, navigate to the "Bootloader unlock" section, choose "All other supported models" from the drop-down menu, and provide the unlock token when asked.
13. After unlocking the bootloader, you can flash a custom recovery partition via fastboot, boot into recovery mode, and use a recovery ADB shell or install from an update.zip to install Superuser and su (I do not provide support for custom recoveries, but this is a straightforward process that other people can help with).

Source: xda-developers

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