Garmin Zumo 66x latest firmware problem. I upgraded to the latest firmware that came out on April 1st and the BlueTooth Audio just went to heck.. It seems that the AD2P function between my Scala and my Garmin disappeared, sound quality degraded so bad it hurt and although hard to tell, the music was no longer in Stereo from XM or MP3. I switched the pairing from my Garmin to my iPhone and ahhhhhh... The sound of sweet music once again... Bach and Iron Maiden never sounded so sweet.. Can anyone else tell me if they tried the latest ZUMO firmware (zumo 660 (GCD File) software version 4.90 ) released April 1st and can you comment on the ability to use a Scala BT (Schuberth as well) or other (please identify model headset) with the AD2P / Stereo and can you move between songs from the headset? Thanks in advance as we all want to get this fixed..