I'm a happy Car Report user for quite a while now, and I see the project has come a long way. Because the F-Droid version of your app can no longer include the latest functionalities, I'd like to give it a try and remove the functionalities that depend on proprietary components.
I believe it all started at commit 8d46a9553, so my intention would be to track these down up to current master and see what could be removed. If you could provide me some tips on what actually depends on proprietary parts, things could go a lot smoother.
Thanks for the awesome app!