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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@user51876
Is it possible to flash several boards simultaneously? Make USB fork cable with DO from host to all board, DI from one and hope fo the same timing.
I think no need to perfom total testing. You can check let say one panel from beginning, middle and end of batch. The probability of short circuit in such production is negligible.