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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.
@Jean-Philippe_Rey
I've always seen this same deposit on the puck after some time inside the silicon cover. As far as I can tell, no damage inside the module. Sometimes I clean it but to be honest I do not take this too seriously. You can add some tape on the RF shield to isolate it from the silicon cover it should protect it