Huawei Mate 9 MHA-L29 android 9 firmware update is now available for Asian variants. The firmware version is 178. This update is only applicable to phones with cust version C636. Android 9 is running EMUI9 on top. This is official stock firmware from Huawei and can be installed by following the official method. You can either use sd card/OTG to install it or any 3rd party tool can be used. This firmware can help unbrick your phone.