Hi! I see you’re having trouble connecting the HND app to Bluetooth on your iPhone running iOS 18.5.0. I’m here to help you get this sorted. Could you tell me a bit more about what happens when you try to connect? For example, does the app show an error, or does your device not appear in the Bluetooth list at all?

Meanwhile, here are some initial steps we can try to fix Bluetooth connection issues with the HND app:

1. Check Bluetooth is On: On your iPhone, go to Settings > Bluetooth, and make sure Bluetooth is toggled on. You should see a list of devices available.

2. Charge the Device: The HND device itself should be reasonably charged. Sometimes low battery can prevent Bluetooth pairing.

3. Restart Devices: Turn off Bluetooth on your iPhone, then turn it back on after a few seconds. Also, power off and power on your HND device.

4. Forget and Re-Pair: If your iPhone has previously paired with your HND device, tap the "i" icon next to the device in Bluetooth settings, select "Forget This Device," then try pairing again from scratch within the app.

5. Close and Reopen the App: Sometimes restarting the HND app can help refresh its Bluetooth functions.

6. Update the App: Ensure you have the latest version of the HND app installed.

7. Reset Network Settings (if needed): If the connection still fails, you can try resetting network settings on your iPhone by going to Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings. Note this removes Wi-Fi passwords, so keep that in mind.

If you’ve tried any of these steps already, just let me know which ones, and we can explore some advanced troubleshooting next.

Does the device show up in your Bluetooth list when you open Settings?