How to Update MB SD Connect C4 Firmware

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If you had “00” icon and “Initialization of diagnosis multiplexer failed” problem when using the MB SD Connect C4 multiplexer, you need a sd c4 firmware update.

Follow steps below to update C4 firmware:
Run an sd connect c4 firmware update:
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Go to C:\Program Files\Mercedes-Benz\SDConnect Toolkit, change update_automaticx, update_manualx and update_specicalx 3 files to update_automatic, update_manual and update_specical (delete the x letter).

Go to C:\Program Files\Softing\Diagnostic Tool Set 8\8.03\Interfaces\DCDI_DPduApi\eCOM_Toolkit, change update_automaticx, update_manualxand update_specicalx files to update_automatic, update_manual and update_specical (delete the x letter)
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Restart computer update change the files’ name.

Install 6 AA batteries to SD C4/SD C5 main unit (* SD C4 Item No. SP100-E does not require battery installation)

Connect OBD main cable with vehicle with 12V adapter.

Right click on lower right corner of the computer and select Administrator, then choose Software Update
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Update 01_Bootimage_2_3.zip, 02_CSD_2_10.zip and 03_PmPic29_Cpld13.zip three files one by one until succeed.
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Note: The update process can be applied to SD Connect C5 clone as well.

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