After Updates, System can't boot. Repair is required. Is it possible?

Skakner said:

Win 10 Home v.2004

On Saturday, some updates were downloaded and installed. Sunday morning all good. Sunday evening, out of the blue, during booting up, I see ''Preparing Automatic Repair etc'' and after a while ''Automatic Repair couldn't repair your PC''. After Advanced Options I tried to uninstall the latest updates but another failure. My next step was to use a bootable USB but ''Repair your computer'' failed too.
I don't know what else to try, if there is something besides format...

Fortunately, my system has two disks with OS (10 Home and 10 Pro) so I can use the second one.

Thanks in advance...

If your important data is backed up then you could do a clean install or better yet if you have a backup image made before the issue began you could reinstall that.

my system has two disks with OS (10 Home and 10 Pro)

- could you explain - are you dual booting? or physically swapping disks? Or something else.

Do your comments mean you can boot with one disk and you only have the failure with the other?

Your configuration is very unclear at present, and how you swap between the two.

My next step was to use a bootable USB but ''Repair your computer'' failed too.

- at exactly what point, with which option, and how?


Have you been using disk imaging regularly and routinely as is so often recommened here?
(I almost never get an answer to this question)

Hence my question about the vague statement

My next step was to use a bootable USB but ''Repair your computer'' failed too

- not even clear this progressed to any usable options from that statement...