Can't Install 4.2.1 about airfloat HOT 2 OPEN

I have the same problem. This occurs with Cydia 1.1.12. If I instead use the version of Cydia that is bundled with redsn0w 0.9.6b6 AND DO NOT UPDATE CYDIA, AirFloat will load, but will crash on launch. This is on the same HW as above (iPhone 3G, 4.2.1). If I upgrade Cydia to the latest version, it will not let me re-install AirFloat...it give the same error as above ("Firmware >= 4.0" error). I would really like to get this to work. I have tried some bluetooth audio players and they really sound like crap on my stereo...I'm hoping this will work (and sound) better...but I've spent more then 1/2 day trying to make it work :-(

from airfloat.

This appears to have been broken for a long time. See this thread for details: #6 (comment)

Unfortunately, even following the steps above and downloading the DH version of the app, I can just BARELY make it work. After much fiddling I CAN get a song to play, but changing songs crashes the app, and it just isn't stable enough for what I need (which is to put it on a shelf and hopefully never have to touch it...which just can't happen in the current state).

Was really hoping to use my old iPhone 3G for this, but I guess I'll have to buy an Airport.

from airfloat.