Hi there,
To check your last BIOS time in Windows 10:
-Launch Task Manager (Ctrl+Shift+Esc) and click the "Startup" tab.
-Look for "Last BIOS time" in the top-right of the window.
You'll see your "last BIOS time" in the top-right of the interface. The time is displayed in seconds and will vary between systems. A blank space means your motherboard's firmware doesn't expose this information, so Windows can't display it.
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