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Not sure what they used, but even a Raspberry Pi + a Pomona clip will do the trick. Have a look at the flashrom wiki, see https://flashrom.org/ISP.

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Careful though, and read the datasheet first! AM4, for example, uses 1.8V SPI flash chips. Connecting them to Raspberry Pi directly will at the very least fry the chip, if not the whole board.

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