Check support
Check Treble support with TrebleInfo
Treblize
Of course Nvidia Shield Tablet doesn't support Treble. But this should be simple, it's just repartitioning and moving some folders around as I understood from this thread.
So let's get started.
Do I need TWRP with Treble Manager (like this, or this old version with screenshots)?
Behind the hood it's just this list of instructions
Here's an explanation how to make TWRP for A/B devices
This is my plan:
- From Lineage 15 read
/proc/cmdline, check that selinux and dm-verity are disabled (we are going to change partitions and next boot should not fail just because partitions are changed) - Build TWRP with Treble Manager merged from this repo
Just in case https://forum.xda-developers.com/t/tool-tissot-low-level-backup-restore-unbrick-toolkit-for-mi-a1.3790307/