Hi,
first of all.. sorry for my bad english. A user from another forum suggested me to post here my problem because it seems yours is the best forum for Audi Ab B8 owners.
I searched a lot in the forum without finding a solution to my problem.
I really hope you can help me to understand the problem (already asked in many forums but without success).

I try to explain:
Car: Audi A4 B8 '09 with original Bluetooth. No MMi, Audi Concert.
Bluetooth worked well for years.. now it is stucked.

Trying to connect a mobile phone, I got the permanent message in the display "Please wait..."
Phone is connected (if I use the phone to reply to a call audio is ok from car), but I'm not able to answer/hang up calls with car, search number, show calling number, and phonebook is not available. When I turn the car off.. it loose pairing and I have to search car again.

What I noticed is that when bluetooth was ok, bt name was something like "Audi UHV 0897", now bt name is "Audi UHV 0000"


Just tried:
reset phone settings from Audi "setup"
tried with many phones (android, iphone, old nokia)
disconnected car battery for more than an hour

I had no luck: always the same problem.

A friend used the original ross-tech diagnostic software and this is the faults found:
Code:
01-Engine -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
04-Steering Angle -- Status: OK 0000
05-Acc/Start Auth. -- Status: OK 0000
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: OK 0000
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: OK 0000
42-Door Elect, Driver -- Status: OK 0000
46-Central Conv. -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
53-Parking Brake -- Status: OK 0000
55-Xenon Range -- Status: OK 0000
56-Radio -- Status: OK 0000
62-Door, Rear Left -- Status: OK 0000
72-Door, Rear Right -- Status: OK 0000
77-Telephone -- Status: Malfunction 0010

-------------------------------------------------------------------------------
Address 77: Telephone        Labels: None
   Part No SW: ##H BAS 060 0    HW: ##H BAS 060 0
   Component: FSE_256x BT     H34 0600  
   Revision: 00000001    Serial number: 00000000000000
   Coding: 0000000
   Shop #: WSC 00000 000 00000
   VCID: 2A5BE423850AF24EEA7-807F

2 Faults Found:
00003 - Control Module 
            014 - Defective
             Freeze Frame:
                    Fault Status: 01101110
                    Fault Priority: 5
                    Fault Frequency: 1
                    Reset counter: 255
                    Mileage: 98470 km
                    Time Indication: 0
                    Date: 2016.07.06
                    Time: 11:29:22

01042 - Control Module; Not Coded 
            000 - -
             Freeze Frame:
                    Fault Status: 01100000
                    Fault Priority: 5
                    Fault Frequency: 1
                    Reset counter: 103
                    Mileage: 98470 km
                    Time Indication: 0
                    Date: 2016.07.06
                    Time: 11:29:22


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In telephone, "01042 - Control Module; Not Coded " is quite strange.. isn't it?

Many thanks for your attention