Last night after installing a DSP5 switch I went to do a full reflash on an 03 LB7 and it stopped 509k (out of 512k) into the process and froze, then kicked me out. I tried everything to try and get the ECm to respond and take a calibration but nothing ive tried seems to work. Tryed it without high speed, unhooked batteries for 15 minutes, but still everytime I try to flash it I get the message "no response from ECM."

I dont know if the ECm took a poop or what. I have another ECM out of an LB7 here, and was thinking of swapping them but wanted to see if there were any ideas before I do that.

Also wondering if I swap ECMs do I need a Tech II to marry the ECM to the truck or not?

Thanks much.