Hi, I've just bought a BT FM transmitter to my car to use it with my Mi2. It seems like that phone calling is working with this device but music playing not (a2dp) as media play option doesn't show up during the pairing process. I've tested it with several ROMs ( for example: 3.8.2, QTD14 ) but it didn't work. Than I've tested an old nokia phone with BT v2.1 only which could be paired correctly and played music!!! So I'd like to know if there is possibility to get it work or simply BT v4 is not compatible fully with older BT devices?!