Umidigi One Max

Helio P23 (MT6763T)

Works pretty good. Some issues here and there, some missing features, but mostly usable day-to-day.

Steps to install

Three possibilities :

Install using TWRP (Doesn't require unlock) [RECOMMENDED]

1. Install TWRP into recovery using SPFT method
2. Boot into TWRP : Shut down the phone, press power + vol up. It will bring a menu, you can navigate using vol+ and select using vol-
3. Use "install image" to install system.img into system
4. Clear data partition in TWRP

Install using SPFT (Doesn't require bootloader unlock)

1. Download SP Flash Tool
2. You'll also need the stock ROM for it's scatter file (maps areas in the phone's eMMC)
3. Run SPFT, Download tab, select the scatter file, untick everything except system and userdata (userdata will format data partition) and on the right, you can click on the path to choose the correct GSI instead of the stock ROM's system.img .
4. Press Download an plug your phone which in powered down state (not booted, not in recovery).

Install using fastboot

Unrecommended, shorter to do, but requires a bootloader unlock. [Needs documentation !]

Recommended mods

If you choose to format data, before first boot of the GSI, you might want to install disable-forceencrypt-treble to be able to access data with TWRP (it cannot decrypt currently). Link to it (flashable .zip in TWRP)

You can install Magisk if wanted. You'll need to do the fix in https://github.com/phhusson/treble_experimentations/issues/572#issuecomment-503979784 to have root prompts.

SafetyNet doesn't pass because of wrong fingerprint. There is a magisk mod for that, look it up. It works then.

Hardware support

Component	Comment
Camera	Works as expected (choppy like original ROM)
Speaker / Mic	OK
Bluetooth	OK. Some disconnects at moments but still very rare.
WiFi	OK
SIM / Mobile Data / Voice	Outgoing / SMS is flawless. Ingoing sometimes doesn't appear, but still hard to reproduce. Data works on SIM1 (SIM2 untested) but in low-signal uses, will "glitch out" (shows no data, and 0 signal) but still apparently works like 4G.
VoLTE	Untested
Fingerprint	OK
NFC	OK with Magisk module NFC4PRA, or won't show at all in settings
Offline Charging	OK
Hotspot / Tethering	Wifi / Bluetooth / USB tethering not working when data is ON. Works when OFF.

---

Tested By: @defvs - One Max (EU), PHH AOSP 9.0 v112 - Template created by @zguithues and @hackintosh5

Suggestion:

Please add notes to clarify if/why one should use twrp to apply patches.zip and if in your test runs you the used android 9 asop system_arm64_aonly_gapps_su.img.xz or system_arm64_aonly_vanilla_nosu.img.xz system image file?