If Windows or Linux fails to boot, the EFI Shell allows manual loading of the OS loader:

| Command | Purpose | |---------|---------| | map -r | Lists all mapped drives (fs0:, blk0:, etc.) | | fs0: | Switch to the first FAT32 filesystem | | ls | List directory contents | | bcfg boot dump | View current boot entries | | bcfg boot add 1 fs0:\EFI\BOOT\BOOTX64.EFI "My OS" | Add a new boot entry | | dmem | Display memory contents (debugging) | | dh | Dump all UEFI device handles | | drivers | List loaded UEFI drivers | | reconnect -r | Reconnect all UEFI drivers | | ver | Show EFI Shell & UEFI firmware version | | help -b | List all commands with pagination |

indicates you have a modern, up-to-date UEFI environment. If you are here intentionally, it is a powerful tool for system administration. If you arrived here by accident, it usually indicates a missing boot device or incorrect boot order in your BIOS settings.