This web page will help. And this YouTube video has more information.
Microsoft PC Health Check says my Optiplex 7020 is not compatible with Windows 11 because it does not use secure boot. Switching on secure boot requires changing the boot from Legacy to UEFI. If I try to do this, I get a message "No boot devices found". Is there a solution to this?
Optiplex 7020 and Windows 11