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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
I got earlier V2 Droihealth apk, it is not so obfuscated so most code is present and it looks like is support (mostly?) Nordic based devices since the firmware update code uses DFUService classes from Nordic. Howewer that older version does not suport I9 device. Also I found the device is sold with Lynwo I9 name so this gives some interesting google hits.
As for firmware my device shows version V3.11, it can be seen on different youtube videos that versions V3.06 and V3.12 are available https://youtu.be/Sm2Nqy8hT_0?t=31
https://youtu.be/3pZ1ieWn6Nk?t=55
yet the app does not offer me update from 3.11 to 3.12 :-( I will check the traffic but guess it will be https.
As for the ID brand, that's why I got the ID115 one but sadly the one I got is not Nordic based.