01.Why does the VAN 9003 Error happen?
In 2026, Riot's anti-cheat system, **Vanguard**, requires Windows 11 to be running with all its security layers active to prevent hardware-level cheats. If your BIOS is configured in legacy mode or if **Secure Boot** is off, Valorant simply refuses to start. Resolving this requires a visit to your computer's BIOS, but it's a permanent fix.
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02.1. Checking the current state in Windows
Before touching the BIOS, see what's missing:
- Press Win+R and type
msinfo32. - Look for 'Secure Boot State'. If it shows 'Off', you need to enable Secure Boot.
- Look for 'BIOS Mode'. If it shows 'Legacy', you will need to convert your disk to GPT before enabling Secure Boot.
03.2. Enabling Secure Boot in the BIOS
Inside the BIOS (General Steps):
1. Restart the PC and repeatedly press the DEL or F2 key.
2. Go to the Boot or Security tab.
3. Disable CSM Support (This is required to enable Secure Boot).
4. Change 'Secure Boot' to Enabled. If it says 'Not Active', change the mode from 'Standard' to 'Custom' and then back to 'Standard' (This resets the security keys).
5. Save and Restart (F10).
04.3. TPM 2.0 (fTPM / PTT)
Don't forget the TPM: In addition to Secure Boot, TPM must be active.
In 2026, modern processors have TPM built in. Look in the BIOS for fTPM (AMD) or Intel Platform Trust Technology (PTT) and make sure it is enabled. Without this, even with Secure Boot on, Vanguard may present the VAN 9001 or 9003 error.
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Written by a verified expert
Douglas Felipe M. Gonçalves
Expert in Windows system optimization with years of experience in hardware diagnostics, kernel tuning, and advanced technical support. Founder of Voltris and developer of the Voltris Optimizer.
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By following this guide on Valorant VAN 9003: How to Enable Secure Boot and TPM (2026), you are equipped with the verified technical knowledge to solve this issue with confidence.
If you still have difficulties after following all steps, our expert support team is available for a personalized remote diagnosis. Every system is unique and may require a specific approach.