Windows 2025 - Hyper-V error "Microsoft Virtual BIOS (Instance ID ... ): Error 'Invalid Signature.'."

[Guest /u/trs-eric]

Hi all, I'm running Windows 2025 on my home lab and I have some hyperv VMs, but after shutting down a couple I noticed I can't start them again. They are all saying:

 

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The application encountered an error while attempting to change the state of 'Machine Name'.

 

'Machine Name' failed to start.

 

Microsoft Virtual Bios (Instance ID .......): Error 'Invalid Signature.'.

 

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I tried disabling CSM and enabling TPM, but nothing I set changes the error.

 

Is there a way to disable the error or reset the signature so it is valid again?

 

submitted by /u/trs-eric

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