It varies per device, but the wiki also has some information about which firmware is needed/where more research needs to be done/which free software re-implemen

It varies per device, but the wiki also has some information about which firmware is needed/where more research needs to be done/which free software re-implementations exist. One example: https://wiki.postmarketos.org/wiki/Samsung_Galaxy_SII_(samsung-i9100) https://wiki.postmarketos.org/wiki/Samsung_Galaxy_SII_(samsu... (I'm a developer)