is built upon the Android Open Source Project (AOSP) but includes optimizations from Huawei that are difficult for independent developers to replicate. Prizm Institute Optimized Performance & Stability : The stock ROM is tuned specifically for the HiSilicon Kirin 655 octa-core processor and Mali-T830 MP2
The Official Huawei Honor 6X (BLN-L21) Stock ROM: Why It’s Better Than Custom ROMs official huawei honor 6x blnl21 stock rom better
For many users, sticking with the factory-issued firmware (EMUI) provides a more reliable experience than experimental custom alternatives. Stability and Reliability is built upon the Android Open Source Project