Find the Secure Boot option and change it to Disabled. Save the changes and reboot again. We recommend keeping Secure Boot enabled unless you're sure it needs to be disabled. This article explains how ...

Microsoft has started rolling out new Secure Boot certificates that will automatically install on eligible Windows 11 24H2 ...

I have yet to find any mention of problems with Windows 11 if you disable secure boot after installing it. I’m assuming this would be quite a prominent matter and easy to find if there were such ...

You shouldn't have to worry about much, but you can check if you have the new certificates already.