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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.
Guillaume_G
Hi @Guillaume_G I actually had a similar situation. Was charging every five days, let the watch sit for several weeks, then watch apparently wouldn't boot, providing the dreaded black screen as you describe. After several failed charging attempts, I did a Long-press BTN1 + BTN2 for about 6 seconds reset, then plugged in the cable and left the charging cable on in excess of five hours. Left for the day. When I returned, the watch did power on and boot.
Maybe the secret is leaving the watch alone for some private time! ;-)
p.s. Don't know whether your data will be retrievable though. . . .