52840 ?

[asdf23]

Does your app support this watch: https://www.amazon.com/Fitness-Waterproof-Swimming-Detection-Tracking/dp/B08BC3QTTR I believe that this watch is sold by a few companies which all seem to call it "CS201". They use an app called "Zeroner Health Pro" that app labels my device as a "CS20X-0926". This has a "Nordic 52840" chipset. Do you know if it would be compatible? Is there anyway I can help contribute?

[atc1441]

Hey. Unfortunately that watch will never be supported by the app as it uses secure dfu so its not possible to install any custom firmware.

If you open it its possible to reflash it but it is very thigt closed

[samdakap]

Hi @atc1441 , can you be more specific about how to know whether it is secure DFU or not? I have a Lidl Silvercrest armband, and I just opened it. I confirm it was a nightmare at first, but then I found the trick: turn on your heatbed from 3D printer and program it at 110°C. Wait for stabilization of temperature, and put the watch face down for 1-2 min. Then you can remove it much more easily with flat screw driver. I guess the trick is that the watch is IP67 water resistant, so they had to put extra silicon gaskets to get the certification.

Anyways, after opening the watch, it reads that it is N52832, and yet, your app does not recognize it... As you mentioned "secure", I wonder whether it related to the fact that even the Bluetooth connection not only asks for a password, but also requires the Lidl App...

So the question is:

• can I flash on a N52832?
• Can I do it without installing the Lidl App, since the watch is already open?
• How to do it? I don't see any serial stuff, like I used to when I had to flash Lidl SmartHome Gateway. Or maybe it is hidden behind the screen?

Thanks.