Hi there! I’d be happy to help you with the NFC synchronization issue between your IW10mini smartwatch and the RDFit app. To get started, could you please share a bit more detail? For example:

- When you try to sync via NFC, does the app show any error message or does it just not respond?
- Are you able to sync data through other means, such as Bluetooth?
- Have you checked that the NFC feature on your Android device (WebKit browser on Android 10) is enabled?
- Have you tried restarting both the smartwatch and your phone?

This info will help me guide you step-by-step to get the synchronization working again. Looking forward to your reply!

• not showing any errors .
• yes, no problem with bt .
• my Telefone able to use NFC. Tested. Have no idea about WebKit.
• yes restart was tried. Connection was established from another phone. Same result.

Thanks for the details! Since Bluetooth syncing works fine and NFC on your phone is confirmed operational, but NFC sync still doesn’t happen with RDFit on your IW10mini, let's try a few focused steps:

1. Confirm RDFit NFC permissions and settings:
- On your Android 10 phone, go to Settings > Apps > RDFit and check that it has permission to use NFC and location (sometimes NFC requires location permission as well).
- Also, ensure in the RDFit app settings that NFC syncing is enabled, if there is such an option.

2. Phone NFC settings:
- Double-check NFC is enabled at the system level via Settings > Connected devices > NFC.
- Try toggling NFC off and back on again.

3. Positioning and timing:
- When you try syncing via NFC, make sure the watch is very close to the NFC sensor area on your phone and hold steady for a few seconds.
- Sometimes the NFC area is at the back-center or top of the Android phone, so try shifting the watch around that spot.

4. Clear RDFit app cache:
- Go to Settings > Apps > RDFit > Storage, then clear cache and maybe app data (note clearing data may require you to log in again).

5. Reinstall RDFit app:
- Uninstall and reinstall the app to ensure the latest version is installed and there's no corrupted data.

6. Check for app or firmware updates:
- Make sure your RDFit app and IW10mini firmware are updated to the latest versions.

7. Test NFC with another app:
- To isolate the issue, use another NFC app (like an NFC tag scanner) to see if the watch can communicate or trigger NFC events, confirming the watch’s NFC functionality.

Since you mentioned the RFID sync works when using another phone but still gets no error on your Android 10 device’s RDFit app, this might point to the app's NFC integration on your specific device.

If after these you still get no sync, the RDFit app may need specific support for your phone model’s NFC implementation.

Let me know which steps you’ve tried already or if you want me to guide you through any of these in detail!

Also, I looked to confirm this aligns with typical RDFit guidance and NFC troubleshooting on Android 10 devices1 4.