Here is the customer solution of reworking a SDconnect c4 PCB chip to get it work with Mercedes 12 and 24 volt cars. Good luck!!!
some of the NEC Chips are Broken 4 PCs and same the small board power chip i Change it and now they work on 12V too
i change the first line from left side

Replace the chip

SD connect C4 china clone with boards of high quality:

Source: http://www.obdexpress.co.uk/wholesale/mb-sd-connect-compact-4-star-diagnosis-hdd-d.html
SD connect mux with PCBs above is confirmed to work no issues with Mercedes 12 and 24 volt cars.
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