Handheld U7135
v.9r08
06 Grand Cherokee SRT8
Bought the handheld and immediately had to update it; found the software HERE

and did so. Went out to my rig to install the tune, things are looking good (so far). The factory tune is saved into my handheld (awesome, getting closer). Then I go to install the 91 oct tune (for stock to mild configurations). Download begins...then PSYCH!! My GC starts making a ticking noise (no it was not nor was it ever running). And the handheld displays something to the effect of tune not installed, not licensed for this vehicle!! SO I'm thinking, ok put the stock tune back in...SAME THING HAPPENS!
So now I am very worried, can I even drive my rig?! How do I at least get the stock tune back in? (I have not done anything with the vehicle since this happened - I am too damn scared off frying/messing something up at this point)
Chris