The message Windows Boot Manager has been blocked by the current security policy means that the computer’s firmware is stopping the bootloader from starting up because it does not meet the Secure Boot ...
Your PC might mistakenly detect external drives, removable media (USB devices or non-bootable discs), etc., as bootable devices and attempt to boot from them. In this case, remove or disconnect ...
Unless your computer is pretty old, it probably uses UEFI (Unified Extensible Firmware Interface) to boot. The idea is that a bootloader picks up files from an EFI partition and uses them to start ...
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