There's a few different approaches to this. Here's one page about it, I'm sure there are plenty more. https://fsfe.org/activities/android/liberate.en.html htt

There's a few different approaches to this. Here's one page about it, I'm sure there are plenty more. https://fsfe.org/activities/android/liberate.en.html https://fsfe.org/activities/android/liberate.en.html