05 Scion tC here with F90BT unit. Think I am running the 3.3 BT software, but since I just updated the firmware to 3.0, BT has not been working right and now not showing the version number anymore. Going to re-run the 3.3 update and see if that helps.
For microphone, I mounted it to hang down from the driver's side visor, virtually in front of my face while I am driving. Amazingly it seems to make a difference just between being held between visor and ceiling and just hanging down off the visor so assuming mic is omnidirectional. And I would consider Scion tC's pretty quiet compare to som