Wi-Fi: 5 GHz Not Connecting on Some Devices

The problem

Some devices stay on 2.4 GHz because of client compatibility, channel selection, signal strength or security settings.

Recommended approach

Check the client capability, AP channel, width and security configuration before assuming the AP is faulty.

Step-by-step checklist

1. Test the same device near the AP.
2. Check whether it supports the selected 5 GHz channels.
3. Try a compatible channel width.
4. Confirm WPA settings.
5. Compare with a known-good 5 GHz client.