Run Win10 Repair Disk On A Uefi Bios

I've only begun using Windows 10 with a current motherboard build that demands it. Even that is not new: Asus Prime A320M-K with A Ryzen 5400g.

The Repair disk that Windows makes, which is one of the first things I did does not allow the
command to bootrec /fixboot, but does allow bootrec /fixmbr.

And I've seen some fixboot procedures but I'd like to get the opinion here on it.
Does the BIOS for this Asus require different formatting for the media to have fixboot work.
I don't know what GPT is and have always used MBR.

These are all things I have to straighten out for the new board.

 

Windows 10 UEFI installs don't allow the /fixboot command to run in the preboot environment, and as of 22H2, you can't actually run them on a BIOS install either (which is kind of frustrating as that is one of the steps to repair a corrupted BIOS boot partition).

In any case, to fix UEFI installs on the latest versions of Windows 10, what I've ended up having to do is recreating the EFI boot partition from scratch. This article goes over it pretty well: How to Restore Deleted EFI System Partition in Windows? | Windows OS Hub (woshub.com)

 

Thanks for answering I'm very surprised this isn't a bigger issue. I have sudden shutdowns/power breaks for one reason or another or simply pulling a plug on something inattentively. I normally don't do any partitioning at setup.

 

I RTFM'ed for my ASUS board. Something called the Exit Menu ( I think under the
Advanced BIOS screen) has a last item called 'Launch EFI Shell from USB drives.'

Perhaps you can help with a more complete discussion of this. I did look at the link but really need to take the steps slowly for comprehension. All of this is different and new for me but if it can go slowly I should be able to get it. I'd like to get the link info printed to paper for safekeeping as well. No printer so I have to do it at a library.