MSDxx DMEs, you have to back up data as a single file bench or boot mode (HexProg). There was discussion about it some time ago. If any issue arises, restore possible. Do not read / write P/D Flash and EEPROM separately. If you can still read DME that is no problem, you are lucky. You need a single back up file. What VIN / PN you need. You can contact me on PM.
VBR, abc123