It was just for fun, and this would be a good exercise for potential migrating my AT&T phone to some other images – I need hotspot feature but it’s a premium feature from AT&T …
Back to Kindle Fire, the process was pretty simple – root it, flash with new root image and gapp, that’s it. However, after that it seems some Apps are not that stable, crash or slow respond from time to time, though some other Apps run smoothly. I’m not sure so far if it is problem from Apps (i.e. compatibility issue with Jelly Bean), or it is Jelly Bean I was using is having problem with Kindle Fire (incompatible or poor hardware). I will play with them for a while and post here if I see anything interesting.