Hi, I have tried many times, but it still show "Cannot mute off HFP connection and an error occurs" . I know use "Btsdk_AGAP_AudioConnTrans" function to switch audio card. but the record device of PC can not change to bluetooth's mic., Could you give me a hand? BTW, I uses BlueSoleil 8.0.395.0 and uses SDK 2.0.5 to develop ! thanks a lot....