no crank no ctart no communication after trying to reflash computor

OK i have came into the problem after the problem started from another shop the other tech was using GM tech 2 trying to re-flash the ecm to the latest software version the tech 2 erased the ecm but keeps loosing communication with ecm when trying to load the new software the truck was having issues before hand it had a misfire was surging at an idle and would not make boost that's why they were trying to re-flash the ecm this is an LLY truck i have a ton of experience with common-rail cummins engine but have basically zero duramax experience any help would be apreciated thanks again d.j.

Holy lack of punctuation, D. J. Jesus man. How do you expect us to read that crap? LOL

Figure it out?