How to fix Error 671 on Windows 11

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Windows 11 Error 671: Device Missing in System BIOS MPS Table

Why This Error Happens

This error occurs when the Multiprocessor Specification (MPS) table stored in the system BIOS does not correctly enumerate a hardware device connected to the motherboard, typically due to an outdated or buggy BIOS/UEFI firmware version. The MPS table is responsible for informing the Windows kernel about interrupt routing (IRQ) and processor-to-device mapping; if a device is absent from this table, Windows cannot safely allocate resources to it and disables it. This is almost always a firmware-level issue rather than a Windows configuration or driver problem, meaning software-side fixes will not resolve it.

Step-by-Step Resolution Guide

  1. Identify the exact motherboard/system model and current BIOS version.
  • Press Win + R, type msinfo32, and press Enter.
  • Note the BaseBoard Manufacturer, BaseBoard Product, and BIOS Version/Date fields under System Summary.
  1. Check the manufacturer’s support site for a BIOS update.
  • Go to the OEM’s official support page (e.g., Dell, HP, ASUS, Lenovo) and search using your exact model number.
  • Download the latest BIOS/UEFI firmware package specifically listed for your model — do not use a generic or mismatched version.
  1. Update the BIOS following the vendor’s recommended method.
  • Most modern boards support BIOS Flashback or an in-BIOS update utility (accessible via F2/Del at boot).
  • Alternatively, use the vendor’s Windows-based update utility (e.g., Dell Command Update, ASUS EZ Update) to apply the firmware while in Windows.
  • Ensure the system is on stable power (plugged in / UPS-backed) during the flash process to avoid corruption.
  1. Reset BIOS to default/optimized settings after the update.
  • Enter BIOS setup (F2/Del at boot) and select Load Optimized Defaults or Reset to Setup Defaults.
  • Save and exit (F10), then allow Windows to boot normally and re-detect hardware.
  1. Reinstall or update the chipset drivers in Windows.
  • Open Device Manager (Win + X → Device Manager).
  • Locate the affected device (often under System Devices or with a warning icon).
  • Right-click → Uninstall device, then reboot to let Windows/chipset drivers re-enumerate it.

Alternative or Verification Steps

  • Verify the fix: Open Event Viewer (eventvwr.msc) → Windows Logs → System, and filter for Event ID 671. If the BIOS update was successful, the error should no longer appear on subsequent boots, and the device should show as functioning in Device Manager without a yellow warning icon.
  • If the issue persists: Contact the system vendor’s support team directly with your model number, referencing “MPS table BIOS Error 671,” as this may indicate a hardware compatibility issue requiring a vendor-specific microcode patch or, in rare cases, board-level RMA.