Download the correct RUU executable (.exe) for your specific region and carrier version of the HTC One X9.
The Process of Firmware Evolution: Updating the HTC One X9 Updating the firmware of a mobile device like the HTC One X9 Firmware Change Update on HTC One X9
This is the #1 question on XDA forums. Here’s the definitive answer: Download the correct RUU executable (
| Error Message | Cause | Solution | |---------------|-------|----------| | | Firmware not for your region (HTC__001 vs HTC__622) | Extract android-info.txt from firmware zip and check cidnum . Change to SuperCID ( 11111111 ) only if S-OFF. | | Main version older | Trying to downgrade firmware | HTC blocks downgrades without S-OFF. Find same or newer version. | | Signature verify fail | Modified firmware or bootloader locked | Relock bootloader ( fastboot oem lock ) and retry. | | Flash timeout | Corrupt eMMC block | Re-download firmware, use different SD card. | Change to SuperCID ( 11111111 ) only if S-OFF
Critical: Your phone’s (Carrier ID) must match the firmware. To find yours: