Yes, they can be upgraded by flashing the routers or modems firmware. If the Actiontec modem or router that you have, is branded for a particular ISP, the proper firmware update will ONLY be available from that ISP. Actiontec can provide only the retail or NCS (Non-Customer Specific) version of the firmware for the router or modem. The NCS firmware can not be substituted for all ISPs but can be configured to be compatible with most. The firmware update for Actiontec routers and modem is available for download on the Actiontec Support site under the "Firmware" section for each device.