Well the A2DP works on all firmwares. It was my mistake. The way to get it work: go to Bluetooth->Handsfree->My Handsfree and select the respect device. If it support A2DP you'll connect in stereo. SE have added PAN support to the latest fws. If you go to My Devices->Connect the phone will try to establish PAN connection (not A2DP). Works on K610 (above R1CE) and W660 (all) fws.