You might wonder, “If my phone works, why risk updating firmware?” Here are three compelling reasons:
Note: Because this is a firmware-level change (affecting modem, secure enclave, and power management ICs), the installation will take slightly longer than a typical OTA — approximately 4–6 minutes. A single automatic reboot will occur.
Most Android 9/10/11 custom ROMs for the X9 (like LineageOS 17.1) require a minimum firmware version from the last official HTC OTA (Over-the-Air) update. If you try to flash LineageOS on stock 2016 firmware, you will encounter: Firmware Change Update on HTC One X9
Several users reported intermittent 2.4 GHz Wi-Fi dropouts when Bluetooth audio devices were active. The new firmware alters the LNA (Low Noise Amplifier) gain table and packet priority timers, reducing RF desensitization by roughly 30% in crowded spectrum environments.
Before making any change, document your current state. You might wonder, “If my phone works, why
Method 1: Using Fastboot (Recommended)
Method 2: Within Android (Stock ROM only) Note: Because this is a firmware-level change (affecting
If your version-main is older than 2.18.709.5 (for Taiwan/Asia) or 2.18.401.5 (for Europe), you are due for a firmware change update.
Over the years, mobile network operators have reconfigured their 4G bands. An old radio firmware may not handshake correctly with modern towers, leading to missed calls or slow data. A firmware update restores LTE stability.
A minor revision to the MIPI DSI command set reduces panel wake-up latency by 120ms when using double-tap-to-wake. Additionally, auto-brightness transition steps have been smoothed to avoid abrupt flickering in low-light conditions.