Right click the file and click Open with EFILive V8. Or open V8 S&T, click F2 Tune, then open the V7 file in there.
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LLY full flash using V7.5 is doing the same thing, DO NOT USE V7.5 for full flashing LLY ECM's. Truck will not run. Have to use V8 to recover.
I'll check on the other ecms and see if the problem is there also.
Related: Flashing-problem-after-latest-update