The "Secure Boot Violation - Invalid Signature Detected" error occurs when the system's Secure Boot feature in UEFI/BIOS detects an unauthorized, unsigned, or invalid digital signature during the boot process. Secure Boot is designed to enhance system security by allowing only trusted, signed software to load during startup. When it encounters a boot file or driver without a valid signature, the system refuses to boot and shows this error. This issue commonly arises due to:
- Booting an OS or boot file not signed or recognized by Secure Boot (e.g., some Linux distros or custom boot files).
- Mismatch or misconfiguration between Legacy BIOS and UEFI modes.
- Old or incompatible firmware or Secure Boot keys.
- External drives or boot devices prioritized in boot order without valid signatures.
- Driver signature enforcement conflicts on Windows PCs, especially ASUS models.
Typical solutions include:
- Accessing BIOS/UEFI settings and disabling Secure Boot temporarily.
- Setting OS type to "Other OS" or disabling Secure Boot Control.
- Adjusting boot order to prioritize internal drives or Windows Boot Manager instead of external devices.
- Enabling Compatibility Support Module (CSM) and disabling Fast Boot in BIOS.
- Restoring default Secure Boot keys or enrolling the correct keys.
- Disabling driver signature enforcement in Windows if caused by unsigned drivers.
- Performing boot repair using tools like EaseUS Partition Master if the bootloader is corrupted.
These actions allow the system to bypass or correct the Secure Boot checks to successfully boot the OS.
If you want, instructions on how to perform these steps can be provided.
