The browser must be changed if not an intuitive one because it may be filled with tons of cache and stored-up data thus slow. Use a clean browser. Firmware upgrade benefits the device, whereas the Wavlink AC600 Setup is simple as it also involves checking the IP address with the IP config command. However, most likely, it will be traceable in the windows of the device. Now just sign in to it. The update check for firmware settings. Check any updates on it. Let it finalize to update.