There are multiple reasons why the Legacy Boot is greyed out in your system BIOS. The following suggestions will help you fix the problem. Before you proceed, if you are using Intel NUC products, you ...

Some users have complained about this problem that when they start their computer, it doesn’t boot. Instead, a Default Boot Device Missing or Boot Failed blue ...

Struggling with GPT disk errors during Windows 11 installation? Discover proven, step-by-step fixes to resolve this common ...

It sounds to me like claiming that all old Windows versions will be unbootable is an overstatement. Rather, it's most likely the case that you won't be able to boot old media when Secure Boot is ...