I haven't tried to update firmware in a long time, because I don't think I need to—my js2 is used solely as a dozenal clock—and I'm afraid of the result of updating. I can say that malaire's Adjust Clock widget works well in my case. I'm still determining what my best setting is, although it's likely to be in the 66+ range, for about 5.7+ seconds a day fast, ca. 40 seconds a week.
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.
I haven't tried to update firmware in a long time, because I don't think I need to—my js2 is used solely as a dozenal clock—and I'm afraid of the result of updating. I can say that malaire's Adjust Clock widget works well in my case. I'm still determining what my best setting is, although it's likely to be in the 66+ range, for about 5.7+ seconds a day fast, ca. 40 seconds a week.