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Also, auto updates! They ship good code but selectively deploy backdoored updates sometimes

How do you verify the chip on a schematic is the chip on the device you purchase?

X-ray it.

From my very basic understanding X-ray doesn't reveal silicon doping layers

Put it under an electron microscope then. That combined with carefully removing metal layer by layer should do the trick.

I'd like schematics for US ships as well. Specially NVidia.

Firmware presents an extra challenge too, seeing as how you basically can't see what was flashed, and most toolchains are proprietary.