Huawei Mate 20 Pro (UD) (LYA-AL10)

Installation instructions and tests

Steps to install

Downgrade to EMUI 9.x and unlock the bootloader

(Software test points using DC-Phoneix and HCU clients etc...) If you managed to get an unlock code back in 2019, that's worth a try too. If you downgrade a device from EMUI 11 or above, you will need a harmony tp cable to reenable USB 2.0 transfer. Regular USB 3.0 cable might be OK (not tested).

If downgrading from EMUI 11, Huawei SCP fast charging cannot be activated.

Flash the image

adb reboot bootloader

fastboot flash system Havoc-OS-v3.12-20201230-Official-arm64-ab.img

Don't forget to do a factory reset in the stock recovery.

Hardware support

Component	Comment
Camera	Works
Speaker / Mic / Calls	Works
Bluetooth	Works
WiFi	Works
SIM / Mobile Data / Voice	Works with China Mobile sim card, others may need to set the access point correctly
VoLTE	Not tested
Fingerprint	No, doesn't recognize the ud fingerprint sensor, see Issue #468
NFC	Not tested
USB transfer	Same as when running EMUI 9 (*)
ADB	Works, but needs to manually set the authorization file (**)

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*If you downgrade to EMUI 9 and can use usb transfer before flashing the system image, you can still use it after flashing. If you can't before, you can't later。

**Copy the /data/misc/adb/ folder from another Android device that is authorized for debugging to this Android device that needs to be debugged, and then reboot.(recommended) or setprop ro.adb.secure 0 (not recommended as it allows debugging from any computer and is not safe).

Tested by

@Cyanide-zh - EMUI 9.1.139 base [Havoc-OS-v3.12-20201230-Official-arm64-ab.img.xz] - Tested 2022.01.20

Template created by @zguithues and @hackintosh5