All the MB Stra C4 SD Connect multiplexer can get free technical support for the device, botht MB SD C4 and Xentry Diagnostic Software under 1-year warranty.
How to solve the problem of five icons appearing on the MB STAR C4/C5 display
There are five icon problems on the C4/C5 display
Five icon problems appear on the MB STAR C4/C5 display

Connect 9V dry battery as shown

Connect the OBD to the car

Open the software C4/C5 management tool
Update 00 01 02 02 03 in order

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