i have a DSP5 tune on my 06 LLY and when i read the calibration data from the ecm at the end a message comes up that says "this calibration containes one or more invalid checksums and is unsafe" ect... by looking at the calibration deffinition file number it goes on to the pcm as a DSP5 tune but comes off with the stock .calz number and there is no custom os there. i tried doing a full reflash and nothing changed. the truck still runs the way it should and all the configured DSP tunes are there. i just cant read off the pcm. anyone know whats going on?