I moved over from Havoc 11, been a long term user of that ROM and no issues switching. Phone isn't parted or re-parted, still a stock partition table. For me it was simple, I hot booted to twrp, formatted both slots, after formatting hot booted back to twrp. Had this ROM on a flash drive, plugged my OTG cable in to my phone whilst in TWRP, and installed via OTG cable.. worked for me.Well, unfortunately, as much as I wanted to run this ROM, I just can't. I read through the thread for the Android 11 version, as well. Anyone who asked for proper install instructions was ignored, and the information here wasn't enough for me to figure out how to do it on my own.
I'll poke my head back in here every so often to see if there's a proper tutorial published. When there is, I'll try again.
Join the telegram group for more help if u need it