all I know is he tuned it with hp tuners and I need to access these files because hes 1800 miles away and cant tune it correctly. so I bought this program to learn myself but dont want to start at ground zero. which ground zero looks to be where ill have to start. I get a script code $0537 - controller locked with custom key

truck is a 1999 gmc sierra 2wd
5.3 with A thunder racing 220/220 -.551/.551 on a 112lsa
milled 862 heads .032 (stock gaskets)
long tubes with ORY
60 lbs injectors
Mp122HH magnacharged
8-9 psi of boost I see now

3200 stall 4L65E trans
3:73 gears
295/45/20 tires

truck has changed since my last signature update fyi

any help to point me the right way would be great! Im afraid to tune off stock settings and might mess up - just being honest