https://lineageos.org
https://magiskmanager.com
OP7P here. Probably the best phone I have ever owned. **** Samsung and their locked bootloader defaults. Sad you have to buy Chinese to get control over your phone.
I'm hoping my phone lasts long enough until the Fairphone 4 (rumors it will be available in the US, but probably 2+ years out).
Recommend Firefox with the standard add-ons (noscript, ublock, better privacy, etc.) and AdAway.
https://forum.xda-developers.com/t/a...5-8-0.2190753/