OEM releases are tied to the BIOS of the manufacturer
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That sucks ,, I upgraded bios and chipset firmware to newest when I first got it
I’m on a chat with Dell right now ..
I don't think Dell would release a BIOS to the customer that would break their own licensing. Here is how it works.
But since you are talking to Dell, you are already on the way to resolve this. Nobody else can help you, not even Microsoft. Once MS sold the sticker to Dell, their role is over.