I was instructed to reset my machine to factory settings.
The original version is Windows 8. The current version is Windows 10 Home 21H2. I downloaded the Windows 10 Home 20H2 version two years ago and yellow warning triangles appeared in Device Manager.
It turned out that I haven't updated the Windows 8 updates and BIOS update from the device manufacturer's website, so some of the OEM updates that came through Windows Update since then haven't been updated, and some of the updates for Windows 10 aren't updated either. Now I don't get the updates to work when the version is Windows 10 20H2 / 21H1 / 21H2 when the updates should have been done before upgrading to these versions of Windows.
I read somewhere that you need to contact Microsoft support before performing a factory data reset on Windows 8.
What should I do to restore the factory settings? Does this factory reset remove any OEM updates I have already received through Windows Update over the years.