Playing with swapping an 12212156 OS from Auto to Manual, using the info i found here http://www.gearhead-efi.com/Fuel-Injection/showthread.php?3677-Segment-Swaps

(i commented there but figured it'd be better as it's own thread)

I believe i have successfully copied the Trans and Trans diagnostic sections from a matching OS (5.3/ manual calibration) but when i try to verify the checksums in EFI live before i reflash them, i get a failure on ENGINE and TRANS diagnostics. efi clip.PNG

EFI says this may be just because it was edited outside of their software, but i want to be sure before i try to write the calibration and brick the pcm.... Any other ways to make sure it's cherry before i hit the button?