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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.
@fanoush
No I don't have the firmware. And sadly the DroiHealth android app is obfuscated so cannot be decompiled easily to see how the firmware is downloaded. But I'll try more.
BTW as for the firmware I had better success with another similar bracelet I got randomly from aliexpress at the same time. It looks exactly like this one http://www.globalsources.com/gsol/I/Smart-bracelet/p/sm/1161181278.htm#1161181278 and the android app is called YOHO sports The app can be easily decompiled so it can be seen how it communicates with the bracelet all the service guids and structures are there. Also when I first connected it and tried firmware update, it downloaded something and updated the device successfully via bluetooth. I now see the code and it connects to alibaba oss cloud storage with all the firmware files supported by the app. The storage has structure of different folders for different device models/displays/chips like HSD_0.96 BOE_0.96 DY_0.42 MC3631 MC3413W HRS3300 each having separate firmware. Unfortunately the MCU is not made by Nordic but possibly by mCube I got the device for $9.79 but for some reason that aliexpress seller raised the price to $17.48 now! https://www.aliexpress.com/item/ID115-PLUS-HR-Smart-Bracelet-2-Replace-Straps-Sports-Wristband-Fitness-Tracker-Heart-Rate-Monitor-Pedometer/32878474822.html however other sellers still sell it in ~$10 price range. The battery life is worse. I used it far less and already had to charge it again after few days. The features are very similar and I can't decide which one I like more.