However, if you experience ghost touches, cellular drops, Bluetooth issues, or you want to breathe new life into this beautiful metal phone with LineageOS 17.1, then updating to the latest 2.18.709.5 firmware is the best investment of 30 minutes you can make.
This usually means the firmware file is for a different model or region. Double-check your MID (Model ID) and CID (Carrier ID). Firmware Change Update on HTC One X9