RS507 support seems to work well in general with this OS release and , as with pairing to a WT41N0, it is necessary to press the 507 pairing button to reconnect to the WT after an out-of-range condition or a battery swap. This works reliably in most cases although I have had one occurence of a re-pairing failure i.e pressing the 507 pairing button did not reconnect to the WT (even after rebooting the 507) and it was necessary to toggle the BT radio power on the WT in order to get the 507 to reconnect.