Solutions
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[email protected]'s post in After Update to UNRAID 6.12.0, Windows VMs are not working was marked as the answerAs I said, there are no hardware issues.
Rolling back the installation to the previous 6.11.5 version fixed the issue. So, if anyone faces this issue, I recommend rolling back the update.
Thanks for the support, but I'll wait for the next bug-fixes release before update it again.