Unexpected Bluetooth & Music App problem

[chewfat]

I have a Lumina 820 phone. Decided to downgrade from DP using the Nokia tool in order to upgrade to Cyan via ATT. The upgrade to Cyan went well except for one thing. I noticed that when I connect using Bluetooth to an external speaker or to the car, and I then try to run the music app, it crashes. The Podcast app loads but hangs when I try to play something via Bluetooth. I then turn off the Bluetooth and soft reboot the 820. Now the music and Podcast app work through the phone speaker just fine. Only until I try to connect to a device via Bluetooth do I have problems. Worked fine when I had DP before the move to Cyan.
I am tempted to go ahead and install the DP (GDR1) to see if it fixes the Bluetooth problem.
Any other ideas?

 

[AV2RY]

Hard reset. Or install DP again

 

[chewfat]

Thanks AV2RY.
When I did the upgrade to Cyan, I did do a hard reset at the time. Just installed DP again and Bluetooth is now working. Hope I won't have to downgrade again to go to denim.