Hey everyone
I had the same problem, my W2100 was stuck on the QR code screen since the Ryeex servers went down and the app was removed from stores.
I reverse-engineered the BLE binding protocol and built a tool that bypasses the dead server entirely and completes the binding directly over Bluetooth. It runs in Chrome on your Android phone using Web Bluetooth no app install needed.
The watch won’t have full functionality (no cloud sync), but at least it exits the QR code screen and becomes usable again.
https://github.com/daniel-pimenta-cc/heyplus-w2100-unbrick
Note: the MAC address and PID are hardcoded for my specific watch. If you have a different unit, you’ll need to update those values in index.html, instructions are in the README.
Hope this helps someone!