Accidentally plugged in 12V UP4000 power supply. Is it fried?

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I accidentally plugged in the 12V power supply for my UP4000 into my UP Squared V1. Now the UP Squared won't fully boot. Is it likely fried, or is there any sort of over-volatage protection on the device? (If I put the old, non-working, build-from-source BIOS onto it, I do see some serial output before it hangs at the typical location. I also connected a logic analyzer so I could see that it still was doing some SPI flash traffic. But it just never fully boots and shows an EFI shell on the HDMI or via serial if I flash a default BIOS onto it.)

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