Firmware of Efficient Networks Speedstream 5200 model e240. This firmware come with all the functions informed by manufacturer: Firewall, DMZ, support for Bridge/Route operations. I used in 3 modens without any problems. If your modem is "dead", in other words, not responding to Ethernet network, install the USB Driver (the USB driver comes with your modem, this is NOT a USB driver, this is a firmware update), connect the modem through USB connection and UPDATE de modem. The software take a long time (1-2 minutes) to find your modem, them WAIT until the button UPDATE turns on. If your modem is not compatible with this firmware, dont worry, the update process will be aborted and you will be notified by the software to avoid damage in your modem.