Error Code 0x803FABC3 after updating BIOS

KEVIN-8612 0 Reputation points
2026-09-15T19:40:57.9766667+00:00

I recently updated the UEFI (BIOS) on a ASRock Taichi motherboard. Now I get this error: 0x803FABC3. I've tried the troubleshooter and clicked on the "I've recently updated hardware" tab. I've tried the product key from the copy of Windows 7 I bought way back when. (I upgraded to 10 from 7 and 11 from 10) I did a clean Windows reinstall last summer without this problem. I can see my computer on my Microsoft account, but can't get it to associate that with my machine now. I've tried calling Microsoft but it says product activation support is only online. After exhausting the steps online, it says to call.

Anyone have any idea what to do next?

Windows for home | Windows 11 | Licensing and activation
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  1. EmilyS726 267.1K Reputation points Independent Advisor
    2026-09-15T20:17:38.82+00:00

    Hello

    If you originally upgraded from Windows 7 or 8, all the way to Windows 11, that's the problem.

    It used to be allowed, but that's a path way Microsoft no longer allows. The free upgrade is meant for Windows 10 only, not all the way to Windows 11.

    This is what Microsoft support has been telling other users.

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