Microsoft is taking its time with the boot certificate rollout, but you don't have to. Activate the latest UEFI CA 2023 right now.

If there are multiple drives installed in the computer, then it can create confusion as to which drive has a Bootloader. This scenario usually happens when Master Boot Record is on the wrong drive.

A damaged or corrupted Boot Manager is one of the main reasons why this error message may occur. Follow these steps to repair your Boot Manager. Since you cannot boot ...

Ensure your PC boots safely before Secure Boot changes.