Gotta say one of the better a12 , just a fyi I tried the payload dumper install but no luck it went to a boot loop, then I saw this post and installed the rom via Nebrassy Twrp and a otg drive rom.zip file install, then a format Incase any one else here is wanting to try it, my order went like this,, your milage may vary ,,
1 boot into bootloader
2 fastboot boot twrp.img ( rename twrp zip to img)
3 . Install twrp by way of radio button in advance, reboot recovery
4 format wipe
5 reboot back to recovery
6 install rom zip file by way of USB C otg
7 wipe/format (probably not nessary but just to be sure)
8 reboot to system and set up
If root is needed
9 I just patched the boot file ( got the boot file from payload dumper) in magisk app and installed the patched file in fastboot
10 fastboot flash boot bootmagisk.img
hth