My first programmer, Already need Help!

[pcwiz13]

I picked up a used Gryphon, when I received it, it already had 2 custom tunes on it, I hooked it up to pegasus and loaded the "canned" tunes back to it.

When I hooked it up to my truck, all looked fine until I went to load a program and got a checksum error. From what I've read this occurs when the stock tune has already been replaced.

I bought truck used about 6 months ago, so this is entirely possible. I understand Bill can straighten this out.

I'm looking to get a custom tune also, whats the best way to get this straightened out?

Thanks a TON! I look forward to trying the programmer out!