6700 stuck in 1.00 bootloader

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I'm trying to prepare my old 6700 to give to a friend, but can't get it reflashed to the stock sprint rom (APAC_SPCS_20600_300_11200_ship.exe, downloaded directly from Sprint). It appears the phone is stuck in the 1.00 bootloader (dark screen, says "SERIAL" until I connect the USB, then changes to "USB".

MTTY couldn't connect (no "USB" in menu), but nueTTY can. The problem HERE is that once I'm connected, I have no idea what to actually DO. Searching returns about a thousand results, and all the results I looked at either didn't resolve the problem and left it hanging, or involved PMs that solved the problem for THEM, but left no information of enduring value for anyone ELSE to read. I've seen dozens of postings saying "use MTTY to run the exit bootloader app", but no hint of what that app actually IS, or how to go about launching it.

So... with the phone tethered via USB, 1.00 bootloader active, and connected via nueTTY... what do I do next?