I think you need to follow the info from this topic:

http://diablosport.com/index.php?name=P ... ic&t=24968

Reboot instructions are in post 5 on the first page and the update file that seems to work for most guys (9r08) is on the 3rd page.

From various posts here, I found I wasn't alone having problems getting my speedometer to read correctly. Differences in tire's actual size to labeled size, rim width, air pressure, etc. all seem to come into play. What worked for me was to actually input "rolling diameter" instead of actual height ...

Thank you so much! It works perfectly - I can't believe how much better the truck drives now.

Mike, I'm getting a little frustrated here now. Even though I really didn't think it had been changed since the last time I tried, at your suggestion I tried 9r12 from your download page again - same result of "calibration not supported". I did a search here for as many crom files as I could find ...

If you were on 9r02, we have released many updates since then, update to the latest and it should be there.

No, my calid is not included with the 9r12, I already tried to install that (as stated in my first post). Is there a newer one posted somewhere other than the download page for the u7186 ...

Mike, do you have any idea when the next revision is due out? Is there any way for me to know if my backup file was received and will be included? If I get my engine computer flashed by the dealer, does that change the calibration id to one that might already be included in the v.9r12 update?

Does anyone know of a version that does work with a manual transmission?

U7186 v.9r02, made 5/15/08
'06 GMC 2500hd LLY (vin 2) manual transmission 2WD

I previously used this programmer my '06 LBZ 4x4 w/auto trans and had no problems. Now when I try to use it on my current truck ('06 LLY) there seems to be some problems.

I can read out my stock file, pick the manual ...