Much learning happened last night concerning corrupted BIOSes and recovering them. A programmer was ordered. It was delivered this morning.
The biggest hurdle so far was that all the info I found assumed Windows, and I didn't have anything convenient to the lab with Windows on it. But I eventually discovered #flashrom for Linux and it is happily talking to the #BIOS via my #CH431A programmer and a 1.8v adapter.
Now I'm trying to find something to install on it that actually works. I tried something for this model and revision of motherboard that *should* have been the next version after what was originally on it. No joy. So now it's currently writing the backup I saved before I started this whole mess. Why I didn't think of that first...