@Dr.Hoffman -- it looks like there is a new BIOS, but this it is irreversible, ie., you can't rollback to a previous version. The last "rewindable" version is F10i. But it sounds like the new BIOS enhances security. I may try to figure this out over the weekend.
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Edit, update: It was easier than I thought and everything is up and running, knock on wood. I added an update to my first post, and here it is, in case you don't want to scroll through all the entries.
Update 2021-12-04: I updated to BIOS F10. The reason I've been dragging my feet with this update is that I had problems with F10h. It did not like my XMP Profile1, and it refused to run unless I ratcheted down the clock speed. Not only that, but the problem persisted when I rolled back to F10g beta.
I managed to figure out how to work around it. After the update, I reconfigure the BIOS settings, including setting XMP to Profile 1, BUT I manually configure the speed to much lower, ie., 2400. Then reboot. If it doesn't load successfully, I have to reset the CMOS, unplug the power, reseat the RAM sticks, then try a lower speed. As soon as I find the lowest speed, I reboot, set the speed a bit higher, eg 2666, then reboot. If it fails, then I do the CMOS reset, RAM reseat all over again. Eventually through this iterative process, I can get back up to 3600. I have no idea why it works, but it works.
Be careful though. With this BIOS update, they specifically warn that you won't be able to rollback to a previous version. I first updated to F10i, and then when I confirmed that I could get the RAM speed back to 3600 with the procedure above, I felt confident to update it to the irreversible F10. So far so good.