Jenkins site is down and the original dev doesn't have a Github, I've looked for a while now. Would be nice to have some sort of update. I even tried the Archive.org wayback machine and it won't pull up the page, even with a snapshot of the site from 2019.
Sucks for us, I suppose. The 5200NEX is great with it's only lacking feature being the absence of Android Auto. Trying like hell to figure out how to get custom firmware but it seems like nobody has any idea and these forums are dead.