@SoggyBottoms, if you're on about the iid tool, then you csn flash the bt module to update the software.
It makes it more compatible with the later smart phones.
if you use the phone for business, then you may be better off with the d4 module, as done by kingpleb.
I have reflashed my old Nokia bt unit with the iid tool, and it's great, the only thing I don't have, is the steering wheel controls don't pan the nameand numbers up or down the screen, however, the answers call button on the steering wheel does work.
all in all, I'm one happy bunny.