Updating the Huawei Mate 8 (NXT-L29/L09) with a custom ROM in 2021 remains a viable way to breathe new life into this 2015 flagship, primarily by bypassing the aging EMUI interface and moving toward a cleaner Android experience Performance & Stability Review (2021 Context) Huawei Mate 8 - Battery Life Endurance Test
Huawei officially stopped providing bootloader unlock codes in mid-2018. If your Mate 8 was not unlocked before ~2019, you CANNOT install any custom ROM today (2021). No workaround exists (paid DC-unlock tools stopped working for Kirin 950 after EMUI 8 updates). If you have an already unlocked bootloader, proceed. huawei mate 8 custom rom 2021