lemmy isn't terrible, but you aren't going to find diehard thinkpad enjoyers flashing them with coreboot here, and you certainly are likely to find much if any documentation on it here either. Maybe reddit. Forums though? Daily occurrence.

Those "forum" channels are locked behind community servers, for some reason. And also still not a replacement for forums. Still not publicly accessible. Threads also suck btw. Matrix likely wouldnt copy them, because forums exist.