Yea the dealer will most likely not work for you as for them it's press one button and the software does the rest. Unfortunately that software needs everything to be normal and unchanged for it to proceed.
Now if you can find a shop with an "Autologic" unit, that will allow you to update just the dme or another other module seperately.
Now if you are good with coding, you too can update just the DME via winkfp, but I shall warn you that if you are not confident with coding don't try it (can result in a bricked DME).
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