I've had a U310BT for a couple years now and have no complaints running on firmware version 1.003(I believe). The only thing I wish to add is Pandora radio. Certainly, I can connect my phone via the mini-jack port but I would to link it via Bluetooth. I've been reading a bit and it seems many have got custom apps on their head units to do various things but I haven't read anything about Pandora.

Has anyone linked Pandora through Bluetooth or know if it's even possible with is unit?

I think A2DP through Bluetooth is the feature I'm trying to add.

unfortunately the bluetooth module itself does not support a2dp, it could be hacked in there theoretically, but it would be an intense project by anyone's standards. if you wanted it super badly, the inside of the unit is mostly empty, and a third party bluetooth adapter could be shoved inside and wired into the aux input.