i have a mercedes W221 156 changing the gearbox VGS unit only ( not the complete valve body), problem is star diagnose does not read the EHS part number for the new VGS , so cannot code & program the new VGS, anyone knows how to put the EHS & coding no to it with develoment mode or step by step on how to do it, tried to follow the step mention on SD media but cannot find icon to save the old data to star diagnose, anyone can help me on which block & what to enter by the development mode, tried transfering old data to new vgs withou success, please advise, thanks in advise
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