I found a backup copy of my unRAID 4.5.6 download and copied bzroot over, but still got hanging anywhere in the boot sequence.
I started digging further into my server, and discovered the last time I was into it, taking it apart, I apparently neglected to put all the screws into the motherboard, so the mobo could sort of flop around a bit. I think there was like one screw in it. I'm of the opinion that I borked my mobo in some important way. It's a Biostar A760 GM2+, and I happen to have a nearly identical TA760 GM2+ in another system. So I swapped that over. Even worse now, I think I borked up the USB lines and I think I fried my USB stick. It no longer mounts or lights up its internal LED when I plug it into otherwise working computers.
[EDIT: I definitely had the USB header plugged in backwards, that my unRAID stick was in. I had the ground pin of the USB header plugged into the V+ jumper, and so forth. I'm pretty sure my Kingston unRAID USB stick is now dead. I have now completely removed the USB header that I was using inside the computer for the USB stick.]
[ANOTHER EDIT: When I was replacing the bzroot file, I made a backup of my (version 4.5.6) unRAID USB stick. In theory if I transfer my Pro license to a different USB stick, I should be able to just copy over the backed-up files, and try that, yes?]
[ONE MORE EDIT: Since I already built a new 16TB unRAID that is up and working fine, would it seem reasonable to just pull the drives from my old unRAID and use a SATA to USB gadget to one-by-one hook a drive up to a PC and use DiskInternals reader to copy data to my new unRAID? Then I could pursue getting my old unRAID working at a later date, or upgrade it with a Clean install to the latest version, etc.? This appeals to me, if this would work.]
—And thus I'll hold off on the following until I try that, but otherwise, I believe I should be able to also try this:
If my understandings of everything is right, my next steps should be:
1. Make sure the USB wiring to the TA760 GM2+ motherboard is correct.
2. Go for clean install of current version, using a new USB stick.
Question: What is the process for moving my license to a new stick?
-Given this info, does that seem like the correct path to getting my old unRAID alive again?