How To Root HTC One X On Android 4.0.3

Step 1: Go to HTCDev.com [Link] and follow the instructions to unlock the bootloader of your HTC One X.
Step 2: Download and setup the full Android SDK [Official Website] or just fastboot for your operating system.
Step 3: Download the following files:

• Interim ClockworkMod (CWM) Touch Recovery [MoDaCo Forums]: Transfer this to the fastboot folder inside your Android SDK folder on your computer.
• CWM-Flashable version of SuperSU [XDA Developers]: Place this directly under /sdcard on your One X.

Step 4: Connect your One X to your computer via USB.
 Step 5: Shut down your HTC One X. Once it is completely turned off, press and hold Volume Down + Power buttons to boot into recovery.
Step 6: Open up a terminal app (e.g. Command Prompt on Windows, Terminal on OS X) and type in the following command:

fastboot flash recovery r1-modaco-recovery-clockwork-touch-endeavoru.img

ClockworkMod Touch will now be flashed to your device.
Step 7:  Now restart your One X and shut it down again. Follow Step 3 to boot into recovery again, except this time you’ll boot into ClockworkMod Recovery instead of your built-in recovery.
Step 8: Take a nandroid backup.
Step 9: Navigate to install zip from sdcard > choose zip from sdcard and choose the SuperSU .zip file you downloaded in Step 2.
Step 10: From the main menu, select reboot system now.