This post will help you if the Master Boot Record writes on the wrong drive when trying to boot from a device. You need to repair BCD/MBR.

If your computer won't boot after enabling the Secure Boot, check if your partition type is MBR or GPT. This post offers working fixes to help you.

Microsoft has released security updates to address a Secure Boot zero-day vulnerability exploited by BlackLotus UEFI malware to infect fully patched Windows systems.