I HAVE A 2012 CHEVY 1500 with 5.3 THAT WE JUST DONE A DOD DELETE. HOOKED UP THE COMPUTER AND DOWN LOADED THE TUNE MADE MY CHANGES THEN TRIED TO INSTALL IN TRUCK AND IT GETS ALL THE WAY TO THE END EVERY TIME AND THROWS Script exited with code $06FF: Checksum failure. I DONT MESS WITH THE E38 VERY OFF TEN JUST Need some help thanks in advance i did try to put the stock tune in it and it threw the same code at the very end