Error codes

Secure Boot is off

Windows 11 and some games require it

What it means

Secure Boot checks that the boot loader is signed before Windows starts. Without it, Windows 11 upgrades and some anti-cheat systems refuse to run.

Common causes

• Secure Boot disabled in the BIOS
• The PC still boots in legacy/CSM mode
• Secure Boot keys were cleared

How to fix it

1. Open msinfo32 and check BIOS mode: it must say UEFI, and Secure Boot State must be On.
2. In the BIOS, disable CSM/legacy boot, enable Secure Boot and load the factory keys (Restore Factory Keys).
3. Save, restart and check msinfo32 again.
4. If Windows no longer boots after the switch, convert the disk with mbr2gpt from a Windows USB or switch back to CSM.