Working with the Shell.
For example, enter the drive, BLK0: or 1 :,
on this drive you can see what is on it. The important thing is you have to look for the boat. When you are on the drive you can display the folder with ls.
Since it is EFI, you can only find the boot in the EFI folder.
So it has to show BLK1: EFI \.
there you will find a subfolder like Boot.
So you give BLK1: EFI \ Boot
if you want to see what's inside, enter ls again.
You can then boot EFI \ Boot \ bootia32.efi
All you really need to do is copy it down as it is.
Play it with Windows, again briefly.
EFI BIOs only recognize up to Fat 32
Then you also need a Fat32 USB stick
The last update in mind was over 4 GB.
Fat 32 only supports up to 4 GB.
This means you can only upgrade yourself via Windows.
So you have to install the last known Windows installation ISO under 4GB and then immediately upgrade to the new version.
Today's ISO installation new 05.2020 May update. In Win 09.2020 October upgrade.
It worked like this for me. You can install the drivers last.
With a new installation delete the whole system partitions except the Windows partition. You can overwrite this and the new Windows creates a Windows old folder.
This gives you the old files, but this Win is no longer executable.