If you could flash it, its not the same issue lol..
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Steve the lly has the boot sector as read only and on a completely different chip.
Basically impossible to brick.
Have him pull the comb out of the comm-bus splice pack, its under the knee bolster kick area. He then needs to pull all the wires except green and purple iirc. That is the datalink connector and ecm. You basically just made a bench harness. Then see if he can flash. That will eliminate all other electronics or modules on the bus as a cause.
use autocal hooked to a laptop with scan and tune. Like moonshine said the software for lly is good.