: The device officially reached Android 10 (EMUI 10.1) globally. Some regional variants, particularly in China, have received HarmonyOS 4.0 updates as recently as February 2024.
If you cannot unlock your bootloader, you can still achieve a "custom ROM" feel through deep system modifications: How to Make the Mate 20 Pro Look Like Stock Android huawei mate 20 pro rom
Developing deep features for the Mate 20 Pro is challenging due to Huawei's locked ecosystem: Bootloader Restrictions : The device officially reached Android 10 (EMUI 10