“If your Mercedes-Benz Star diagnosis SD Connect c4 is locked, do not need to buy a new set and just change this chip is ok.” said a Mercedes owner with MB SD C4 diagnostic tool.
Here is the customer solution to unlock MB Star diagnostic tool sdconnect c4 mux.
NOTE: AT RISK TO TRY!
PCB modification procedure:
1- Carefully open the sd connect multiplexer
2- Check whether some part is easy broken
MB SD Connect C4 printed circuit board in a good condition should be:
3- Possible occasion:
Maybe batteries leaked and damaged the PCB.
4- Blow the chip marked with a red circle by a electric hair drier
5- Disassemble the chip
6- Write the program to a new chip
7- Install the new chip to the PCB, then assemble PCBs into SD connect c4 mux
8- Start SD c4 mux
9- Connect MB SD C4 multiplexer to the laptop
10- SOLVED! And work like a charm, as a good SD Connect C4 at obd2tool.
If method above cannot help you out please contact OBD2TOOL customer service.
Hope this helps!