What am I missing? I've changed OSs before by paying attention to the compatibility chart but this is giving me trouble. You can see the two OS in the screenshot, they both fall in the proper column of the compatibility chart, what gives?

I believe the ecm has been flashed before by someone else but I see no evidence of it being locked in any way, does that have something to do with this? Would if give the compatibility error if that was the case? Thanks!

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old original.ctz

NEW File.ctz