How to remove unsuccessful system update?

So, I've been having this problem for months now. I cannot apply/comple the system update.

It always give me error "An error was encountered during ... "

I've tried so many things. Switching wifi from 2.4 to 5ghz and all other things.

Now I am stuck in version 3.5 and can't update to 3.6

Is there a way to remove all the files from the unsuccessful system update? Should be stored somewhere, right?

I don't want to reimage my steam deck as it is time consuming and I don't want to broke my 1000+ skyrim MODs.

So I guess removing the old update file and redownlod maybe can solve the issue.

Who knows, but worth trying.