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  • That all looks fine to me - SD cards should be 3.3v, as is the Espruino - so you shouldn't need level conversion circuitry.

    However you are doing this in onInit - what if you just paste the commands into the left-hand side one by one to test?

    I have found that sometimes the SD cards take a few seconds to start working after they're powered on - I'm not sure if that could be an issue here...

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