Never flash a BLN-L22 (dual-SIM) firmware on an L21. It will corrupt the modem partition.

: Unlike custom ROMs which can suffer from "crippling bugs" like broken Bluetooth, non-functional NFC, or erratic GPS, the stock ROM is rigorously tested to ensure all hardware components work as intended. Camera Optimization

Here is why the Official Stock ROM remains the better option for the Honor 6X BLN-L21.

: The official firmware includes critical security features like secure boot

The stock ROM passes Google’s SafetyNet out of the box, meaning banking apps, Google Pay, and high-security apps like Netflix (for HD playback) work without workarounds.

remains a notable legacy device, praised for its premium aluminum build and dual-camera system at a budget price point . While custom ROMs offer modern Android versions, the Official Stock ROM