I will post here instead of DP where last post was. I was doing a partial flash, and when the upload said complete, I let truck sit with key off for about 30 seconds. When I turned the key back on, the check engine light was flashing very fast. No crank, no start. Flashscan says cannot communicate with ECM. Removed battery cables for about 10 minutes and retried flash. No luck. Would it be possible to recover frim this tragedy? Would I have to do a full reflash? Is it possible to do a full reflash of ECM in these circumstances?