How to Fix Valorant VAN9001 Error Due to 'Invalid Signature Detected' When Enabling Secure Boot ✅
The Valorant VAN9001 error, specifically when accompanied by an "Invalid signature detected" message during Secure Boot activation, represents a significant hurdle for players attempting to meet Windows 11 and Riot Vanguard's security prerequisites. This technical issue commonly arises when the UEFI firmware refuses to properly enable Secure Boot, often due to discrepancies in cryptographic key management, legacy BIOS mode configurations, or conflicts with the Compatibility Support Module (CSM). Such integrity check failures prevent the anti-cheat system from validating essential boot components, thereby blocking game launch.
The root causes typically stem from an improperly configured UEFI environment, where either the BIOS mode is not set to UEFI, CSM is enabled, or the Secure Boot keys themselves are corrupted or not correctly enrolled. Modern anti-cheat systems like Vanguard rely heavily on a secure boot chain to prevent tampering from the moment of system startup. When the firmware detects an "invalid signature," it indicates a failure to verify the authenticity of the operating system loader or other critical boot-time components against the installed Secure Boot keys, directly preventing the system from entering a trusted state required for game execution.
Resolution requires a methodical approach, beginning with verifying the Secure Boot state and BIOS mode via msinfo32 in Windows. Crucially, the system must operate in pure UEFI mode with CSM disabled to allow Secure Boot to function. The primary fix involves navigating into the UEFI/BIOS settings to restore factory Secure Boot keys. This process typically entails switching Secure Boot to "Custom" mode, locating and executing the "Restore Factory Keys" or "Install Default Secure Boot Keys" option, meticulously saving these changes, and then reverting Secure Boot back to "Standard" mode. This re-enrolls the necessary cryptographic signatures for platform and Microsoft keys, establishing a valid trust anchor for the boot process. Should this initial key restoration prove insufficient, a critical next step is to update the motherboard's BIOS/UEFI firmware to the latest version, as outdated firmware often contains bugs impacting Secure Boot stability and key management. Furthermore, ensuring the Windows OS drive is partitioned as GPT is mandatory, necessitating conversion from MBR if applicable, using tools like MBR2GPT after a full data backup.
Post-fix verification involves a full system restart, followed by another check of the "Secure Boot State" in msinfo32 to confirm it explicitly displays "On." It is imperative to perform these checks after each significant configuration change in the BIOS/UEFI, ensuring the system registers the new settings. Persistent issues may warrant additional steps such as clearing TPM keys, disabling Fast Boot/Fast Startup to ensure a complete boot cycle, or, as a final resort for potential Vanguard corruption, a clean reinstallation of Valorant and Vanguard after running an SFC scan to rule out Windows file integrity problems. Adhering to these precise technical steps ensures the system meets Valorant's security requirements, allowing for unhindered gameplay.
0:00 - Introduction to VAN9001 Secure Boot Error
1:27 - Verifying Current Secure Boot State (msinfo32)
2:14 - Confirming UEFI BIOS Mode for Secure Boot
3:02 - Disabling Compatibility Support Module (CSM)
3:51 - Ensuring Proper BIOS Setting Saves
4:37 - System Restart and Secure Boot Re-check
5:28 - Accessing UEFI/BIOS Firmware Settings
6:09 - Setting Secure Boot to 'Custom' Mode
6:59 - Restoring Factory Secure Boot Keys
7:48 - Executing Key Restoration & Confirmation
8:27 - Re-entering BIOS and Setting Secure Boot to 'Standard'
9:04 - Final Save and Exit from BIOS
9:59 - Updating Motherboard BIOS/UEFI Firmware
11:00 - Converting MBR to GPT Disk (if Required)
11:39 - Clearing TPM Keys (If Applicable in BIOS)
12:25 - Disabling Fast Boot and Fast Startup
13:04 - Reinstalling Valorant and Vanguard
13:43 - Checking for Corrupted System Files (SFC)
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