calibration missing HELP!

[1chevy02]

trying to reflash and i get a calibration missing help need this truck running

[GMPX]

So did it fail on a write attempt before this message?
If so, just click ok and EFILive will continue on and attempt to reflash the ECM.

Cheers,
Ross

[1chevy02]

it just failed after many times we finally took off the battery cables and then it worked

[1chevy02]

any reason for this

[GMPX]

Not really. It sounds like the ECM had got itself in a knot for some reason, hence once you disconnected the battery it reset the ECM to a normal state.

Cheers,
Ross

[1chevy02]

so taking off the battery cables was the right thing to do? I was getting a little nervous as it was not my truck and people tend to thing efi is black magic:grin:

[GMPX]

The Bosch ECM is pretty safe on a write, even a full OS write. It has some nice safety nets built in. You wouldn't pull the battery cable on an LB7!