But coming back to your question.
Yes if you upload the full image, make changes in ECUedit or Romraider (defs required) you can then reflash, as long as flash goes back to same address. Files are not address mapped like an s-record, so the tool would need to be configured to load back to where retrieved.
I dont think JECS ECU use a checksum facility, but a good tool should deal with that anyway.
For accurate tuning though during live scenario you will need a logger. Preferably one that ghosts over the maps, cell by cell.
Unfortunately that's a whole new set of defs to determine where to read live data from.
Have you tried ECUedit logger via the SSM1 option. I get an SSM1 can't find error ?
SSM2 works but alot of parameters are empty or 0.
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