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I can't say for sure though if this tech has moved into common desktop motherboards though. It's beein in Proliants since at least 1998, so I would hope so. Then again, it's still rare to even see a PC motherboard with the ability to have the BIOS upgraded in Windows, or Linux.

Rare? All the boards I've got support flashing from Windows. It definitely works in Abit and Gigabyte boards. My Dell laptop also supports flashing from Windows.