It's impossible to improve the download because these modems work based on frequency, coverage area and carrier's network limits. Try switching the place in terms of area availability and then you will see an increase in the Internet speed. Additionally, turn off the Firewall in your computer or contact the carrier to obtain additional information related to your Internet limits. It's possible that you have exceeded the maximum allowed Internet traffic for the month and because of that, the Internet is limited to a certain bandwidth speed.