The motherboard is from an unknown Chinese OEM and it's using a laptop core i7 but in a itx form factor. I have no idea of the brand, really. The box just says "motherboard" and there's no silkscreen on the PCB (it was very fun guessing which pins were for the front panel). No user manual was included. The bios it says "version: default string"

I hate when OEMs lock down bios settings but here is the opposite, they enabled everything

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[–] [email protected] 5 points 5 months ago

The hint worked! It mentioned to enable csm, but for windows 11 is useless as it doesn't support booting in legacy mode. But it was loading a loader from Rufus before Windows, so I tried to check if it was interfering with that. I checked secure boot. It was enabled but with custom keys by default. Why the F would they create a default with invalid secure boot keys??

Once restored to Microsoft keys, the USB booted without showing the Rufus UEFI loader and the setup recognized the drive.