tl;dr How do I scan specifically for the usb U3, and not "scan all"?
-S antminer:all will probe all devices with only the antminer driver.
Unfortunately, Antminer still does not set the product name on their devices, so there is no way to identify what devices they are without probing.
By default, BFGMiner only probes identified devices, not "scan all"; if you want to turn even that off, use
-S noautoP.S. Due to more pressing issues (medical), I will may sporadically have less time to work on things. Please open GitHub issues for problems so I don't forget about them, and thanks for your patience.
-S antminer:all also causes 5.2.0 to hang. -S antminer in the bat file will launch, but bfg doesn't see the U3 with that. Is there something I can put in place of 'all' that would direct the scan to look at, say, only USB devices? It's something about the "all" that's freezing 5.2.0 on this system.
-S noauto in the bat file works in so far as bfg will launch with that command in the file, but then I have to use device manager in 5.2.0 to scan auto for the nanofury sticks, so really no point. I tried "Enter target:antminer" in the device manager, but no luck.
I guess I'm looking for something like what's in the device manager "For example: erupter:\\.\COM40" that would be tailored toward the U3. Something less encompassing than "all" that will id the U3.
I've never used GitHub, I'll see if I can't figure out how to report a problem there. Judging by my go with bisect, it may take me a round or two to figure it out.