Manual update HTC One X to official Android OTA

1. Make sure that the phone’s bootloader is unlocked and it has custom recovery (CWM) installed.
2. HTC One X should be running firmware version 3.20.401.3 otherwise you will receive an error.
3. Download HTC One X official Android 4.2.2 OTA file [OTA_ENDEAVOR_U_JB_50_S_HTC_Europe_4.18.401.2-3.20.401.3_release_330300ryyxmahrvif4vkyl.zip] from this link, Mirror)
4. Connect the phone to the computer using USB cable and transfer all the files which you got after extracting the zip archive in the previous step.
5. Disconnect phone from computer and turn off the phone and enter recovery mode by pressing Volume Down + Power buttons simultaneously for 10 second till you see Fastboot screen. On the Fastboot screen select the Recovery option. Use the Volume buttons to navigate and Power button to select.
6. Once you are in recovery mode, flash the OTA.zip file
7. Now return Fastboot.
8. Reboot the phone.

If HTC__ID runs 3.20.401.1, need to first update the phone to 3.20.401.3 using this http://fotadl.htc.com/OTA_ENDEAVOR_U_JB_45_S_HTC_Europe_3.20.401.3-3.20.401.1_release_31823765m022e6p4w085de.zip