How to install PE+ 12.1 for certus

As always, firstly wipe data, system, dalvik, cache, vendor
Then flash vendor, rom
After flashing rom install setupwizard and latinime addon (https://t.me/kernelpanicroms/132) else u get broken navigation. You can use skip setup wizard as well if you have one.
Flashing magisk after that mandatory, bcoz u will stuck at fastboot
After doing all that mess u can reboot and wait for first boot. Well done!