Windows: Force WiFi to work only on 5GHz

1. From Control Panel, open Device Manager as Administrator;

2. Expand Network Adapters;

3. Double click on the WiFi device you want to change;

4. Click on the Advanced tab;

5. Select 802.11a/b/g Wireless Mode. Change its value to: 5GHz 802.11a

6. Select 802.11n/ac/ax Wireless Mode. Change its value to: 802.11ac

7. Click OK to save the settings.

The selected 2 modes work only on 5GHz. Select other modes to allow it work on 2.4GHz again.