not suported cal. then tuner is locked

[ericguy320]

I have a flex fuel tuner on my 03 sierra for some time now and it has been working great. I just recently bought a Bi-fuel 05 silverado and put bigger tires on it. Since I never drive the 03 any more I thought I would back out the program and put it in my 05, I got the 03 back stock no problem but when I backed up the 05 it stoped and said calibration not supported, I figured there would be a chance that it wouldnt work because it is a Bi-fuel cng but now the programmer is locked and I cant put it back in my 03.

[Mike_Levy]

You gotta get the backup from the 05 off the tuner. Plug it into the 05, go to Tunes and the select Original Backup.