It’s for Mini M8S II, but should works on any P212 Motherboard based Tv Boxes with 2Gb of Ram.
All instruction are on https://forum.xda-developers.com/android-stick–console-computers/amlogic/rom-mini-m8s-ii-2gb-xannytech-custom-t3513805
If You want to rollback to stock rom for Mini M8S II here the link https://yadi.sk/d/17XGQt7C3GND9p
Use same Amlogic burning tools.
If You have issues with this tool You can try to use older or recommended from manufacturer https://chinagadgetsreviews.com/download-android-marshmallow-6-0-firmware-mini-m8s-ii-tv-box-3.html
Many thanks for Xannytech who made this amazing rom!
If You have any additional questions please ask on XDA in mentioned topic. Im not expert for specific request. Thank You.