1) Ensure your router is connected to your Laptop or PC via Ethernet cable (Yellow cable supplied with router)
2) Open your web browser (

or

or

or

) and enter 192.168.8.1 in the search bar and press enter
3) Select settings and the user name is: admin & Password: admin (found at the bottom of the router)
4) Once in settings, click Dialup on the left and in the sub-menu, click on Network Settings.
5) Change the preferred mode from Auto to 4G Only
6) Click apply, and your Router is now locked on 4G Only/LTE