Even if you do not have a graphene compatible device, you can still install lineage or other custom ROM. Read here: https://darth-coin.github.io/beginner/bitcoiners-mobile-d…

You won't regret it

You won't regret it

What phone do you have? #lineage most probably runs on it. It is not hardened or so. But I ran Lineage and would say for whoever is concerned for running libre software this OS works fine. No need for buying new stuff in order to keep on using what you like.