One of the selling points of the Honor 6X was its dual-lens camera. The camera software relies heavily on proprietary Huawei algorithms (ISP) that are deeply integrated into the Stock ROM.

You would need to flash via using the extracted UPDATE.APP from the main update.zip .

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.

If you agree that the official stock ROM is better, here is the safest method to revert from a custom ROM or recover a bricked device.