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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
He is also the guy who can figure out lot of links to firmware downloads from the android apps so we are currently in the process of going through DFU zips for devices supported by VeryFit apps and WearFit apps. Some are interesting, most new ones has signed firmware. All of them Nordic chips. BTW some already have 52840 chip e.g. the ID205 (possibly this one?). Of course it uses latest SDKs to support that CPU so the DFU is signed. Some of older ones are based on 51442 which seems like odd choice as they are used with BLE SoftDevices, not ANT.
I'll send update if something useful comes out of this. Veryfit are those various IDxxx devices, WearFit app devices are often sold as Wearpai (e.g. the GT-101 FCC ID manual has Wearpai there) but there are many other sellers rebranding this on aliexpress like e.g. Letike.