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@gwennelsonuk @riku @mkukri Our pico-serprog fork can also set the chip select on two flash chips at a time. That way, you can more easily flash on systems with two flashes controlled via chip select from the PCH, where data lines are connected between them at very low resistance.

And Riku also sent patches to flashprog to accomodate this.

Raspberry Pi Pico is the best SPI flasher there is. Nobody should be using a CH341a. Pico is the same price but better in every way. Safer, more reliable.