Hello
How to flash a Custom RoM using TWRP
* Wipe : System, Cache, Dalvik and Data
* Install RoM Zip + Gapps ( + Magisk -- it is optional )
* Reboot To Recovery
How to update a RoM
*Wipe Cache and Dalvik
*Flash RoM
Note: If you had flash Magisk before, you'd need to flash it again.
How to...