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The error messages you're seeing indicate that Secure Boot isn't enabled, which is required for Riot Vanguard to function correctly. To resolve this, follow these steps:
1. Check your BIOS Mode:
- Go to the Windows search bar, type
msinfo32, and press Enter.
- Look for the "BIOS Mode" field. It should display either "UEFI" or "Legacy".
2. Enable Secure Boot:
- Restart your PC and enter the BIOS setup (commonly by pressing Delete, F2, or F10 during the boot process).
- Find the Secure Boot option, commonly located under the "Boot" or "Security" tab.
- Enable Secure Boot.
- Save your changes and exit the BIOS.
3. Check Compatibility:
- Ensure your system is set to UEFI mode rather than Legacy (MBR) mode, as enabling Secure Boot on a Legacy BIOS can render the system unbootable.
Refer to this Riot Games support article for more detailed guidance: Troubleshooting the VAN9003 Error.
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