Reality check: HTC discontinued support for the One X9 around 2018. Most users will not receive OTA firmware updates anymore.
HTC ceased all support for the One X9 in early 2019. The last firmware version worldwide is . No Android 7.0, 8.0, or higher official firmware exists. Firmware Change Update on HTC One X9
This usually means the firmware file is for a different model or region. Double-check your MID (Model ID) and CID (Carrier ID). Reality check: HTC discontinued support for the One
The firmware update on the HTC One X9 brings several benefits, including: Firmware Change Update on HTC One X9