I have older power pup on 03 lb7. I cant download tunes or return to stock. Whats the deal? I have another power pup can I put it on truck or do I need to have ecm reflashed? Any help would be greatly appreciated. I forgot to tell that when I try to use downloader it says flash error and bullydog tech was no help.

come on anything

Have you added any electronics (ie: remote starter, etc.) to your dmax since the last time your PP worked?