1. Prepare 6 AA5 batteries according to Step-by-Step Instruction for how to install MB SD C4 Batteries.
Note: Please do use brand new batteries with sufficient electricity; otherwise, you will fail to update the firmware.
Then, select the green cable to connect to your laptop and MB SD Connect Compact 4 diagnostic multiplexer, and use OBD cable to connect to MB SD C4 multiplexer and your vehicle. (If the vehicle cannot be connected, select OBD 12V power instead.)
2. Open the software “2012.09 DAS”.
Go to C:\ program files \ SDconnect Toolkit to check whether there are the three following files as the pic below shows.
If the files’ names are different from the pic shows, please correct the names the same as the pic shows.
3. Restart your computer.
4. Start to update the firmware according to how to update MB SD connect4 MUX.