The update has screwed my 5.1, which was perfectly setup before! Now The fronts work fine, but the rears are inseparable and there's no solo sub.
Is there anyway to go back to 9.0.1?
I guess that Apple is still signing 9.0.1 so just connect your ATV4 to your computer and do a reset in iTunes, where you've previously downloaded the 9.0.1 ipsw.