get Settings.apk from here:
UPDATE: original article is gone. check archive.org if you want to read it. but you can still get the Settings.apk here
don't bother with the Launcher2, all it does is crash immediately. although if you have a thing for apps that crash immediately, well then there you go. could be it's a year old and maybe we need to try a 4.2 launcher.
like the article mentions, nearly all of the Settings stuff just crashes (plus, some of it I'd be scared to mess with anyway for fear of messing up spamazon settings)
I don't have any 4.2 devices (aside from ~ firetv obvs), but if anyone else does (like standard-ish non-weird device... e.g. generic tablet or phone?) - would you mind pulling settings and launcher apks please? they might be more suitable and less crashy...
I haven't done much but so far I have a bluetooth speaker paired, connected, and WORKING - sound is coming out the BT speaker and not my TV.
even fired up PrimeTV and sound was as normal, only it was the BT speaker.
xbmc? darn right the sound is coming perfectly out of the BT speaker.
now I turned off the BT speaker, and sound is coming out the TV again. seamless as it should be.
turned the speaker back on, and it autoconnected, all fireTV audio is back on the BT speaker again.
no luck with BT keyboard just yet, and have other settings to still mess with...
(also: the spamazon settings are all still there and all still work as before)