I recently installed the OEM retrofit kit with the 13th gen ULF module. My car is a European spec '02 M5, and was prewired for the Motorola V-series mobile phone. However there was no prewiring to the storage box towards the front of the car for the bluetooth antenna (this I installed in the boot towards the back seats).
I am using a Sony Ericsson K800i with the car which is under the approved phone's list by BMW, but the audio quality is terrible. I mean you can hear the other person but you have to strain to understand what they are saying! At times I think putting the phone on speaker would be clearer! I have updated the phone's software and everything else works great e.g. sms/phonebook sync.
I did some research and found there is a bluetooth audio compensator made by BMW as well? Has anyone else encountered this problem...The recipients say they can hear me clearly just a little bit distant. My friend has a 2008 335i Coupe and her bluetooth works like a charm, the audio quality is rich and loud. What I have now feels fisherprice-ish in comparison!
I think it is either:
A) My phone is totally rubbish with bluetooth audio (Hope to test this with another phone soon)
B) I have screwed something up in installing the kit
C) I need something else (Compensator?)
Cheers for any help