Ok I bought one. ... now what?https://twitter.com/RayRedacted/status/1261986263286112259 …
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Well, that's no fun... Do you know where I could read more about how it's signed etc.?
https://sudonull.com/post/125086-UEFI-BIOS-File-Device-Part-One-UEFI-Capsule-and-Intel-Flash-Image … quickly found this here and I wrote a tool parse an image some years ago https://github.com/pgarba/TXE3ImageParser …
When firmware flash image was alrady written into the flash chip there’s only one thing that might prevent it from execution — Intel Boot Guard
... and I have a doubts that such toy computer actually have Boot Guard enabled. Anyway, you can determine it by examining FIT tables in UEFITool
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