![COD MW4 BIOS Update Guide: Avoid Multiplayer Lockout [Confirmed]](https://cdn.mos.cms.futurecdn.net/ADf8vRbBtWTiViXXLTEKWT-1920-80.jpg)
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COD MW4 BIOS update can block online play if your PC lacks TPM 2.0 or Secure Boot—learn the exact steps to patch your firmware now. Read the full guide on 217G.
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