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Are you able to just get on the website and re-install the previous version? I dont remember Its been awhile since I had the BD.
Use the CEL as the reason for bringing your truck into the service department at your dealer and tell them that while they are working on it you want the latest flash update (AX designation for 07.5 model trucks, AP designation for 08 model year MANUAL transmission trucks, AQ designation for 08 model year AUTOMATIC transmission trucks). Having the latest flash should take care of your not-loading problem. If not, PM Bud Kunz on here. He is a program writer for Bully Dog and can email you basically any version you want of the Power Pup.Any diagnostic lights on your dash lit up right now, before attempting to install the powerpup? Sounds like we have same problem, but I have a diagostic light on my dash lit up. Powerpup will not clear it either. May have to take it in to the dealer to clear diagostic code.