This board is hard to flash externally. I recommend desoldering both chips. Default chips are unfriendly with flashing, you should buy new SPI chips with more space. WHen you have desoldered both chips, take new one and flash libreboot into it, when SPI chip is desoldered, maybe you need to connect 2 additional wires to V (PSU 3v wire), and these additional wires (2 wires, from SPU 3v, so in total you will have "3wires x 3v") connect to both NC when you flash the chip. You only need one chip, you do not need to solder backup chip.

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