If you checked,by far,there are many good feedbacks about MB Star C4 MB SD Connect 4 to prove C4 is a great obd2 diagnostic tool for cars trucks . In the normal time, MB Star C4 can work well ,but if you met the problem like below
Pls dont worry,your MB SD Connect 4 was still in good condition and you can just follow this guide to fix the problem you met.
Step 1 : Unscrew and disassemble MB SD C4 to reflash
and this is the correct wiring diagram
Step 2 : Right Click on the icon “StartKeyCenter”,then option “Properties”-“Find target”
Step 3 : c :/programmer\SDconnect Toolkit file,find out last 3 folder :update-automatic,update-manual,update-special, correct names by deleting the final letter”X”.
Step 4 : At the right corner of the desktop,click”Administrator:,this toolkit is being initialized.
Step 5 : Click “00/Cable Accessible”,click on “Register/Configure”,update”CSD_2_11.zip”.
The system software was successfully updated.Back to click on “00/Cable Accessible”,click on “Software update”,then”03PMpic29_cpld13.zip”The system software was successfully updated.Check the information
Step 6 : Back to the desktop,right click on”StartKeyCenter”,then option”Properties”-“Find target”-C:\programmer\SDconnect Toolkit file,rename the last 3 folder,add a suffix”X”,the
final folder name will be update_automaticx,update-manualx;update-specialx.
Step 7 : Done.
You can follow this guide a shot,not so complex.