See link below, if you saved a backup of your tune you can format a new SD card, initialize with MM3 Agent, then copy and paste your tune to the correct folder.
https://www.igotacummins.com/threads...NVALID-SD-CARD
If you didn’t backup your tune, then you will need a new one.
https://www.igotacummins.com/threads...ership-(PLUS)!
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