How To Tell If Cummins ECM Has Been Tuned Before

[Duramax 6.6L]

I have a 2008 Dodge truck that my buddy bought from a dealer and I do not know if it has been tuned or not. How do you tell if an Cummins ECU has been tuned before?

Regards,

Frank

[comnrailpwr]

Read the tune and look at it. If the tune won't read out it's likely locked from a canned tunner for someone has put EFIlive on it. Is also likely has the anti tuning bootloader in it.

[Duramax 6.6L]

Tune reads out fine, just want to make sure I do not have a problem if it was tuned before and then returned to stock with a bully dog or some other tuner.

[comnrailpwr]

In v7.5 tune tool under the calibrations tab where you look at the bin and operating system it will say "do not flash" if the checksum are incomplete.