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Direct Links to 5660 Firmware can be found here:
»Efficient Networks Forum FAQ »Is there a list of available 5660 Firmwares?
2. Set up an FTP server on your computer. SpeedStream is going to try to FTP into an FTP server to download the firmware file. I recommend Serv-U, it's easy. Search »www.download.com for Serv-U FTP. You need to configure your FTP server software to point to the directory where you saved your firmware file(s), and create a user name and password, which you will then enter into the modem's command prompt. For simplicity sake, just make the FTP server give your firmware directory as the home directory for the user you create.
3. Telnet into your modem. For detailed instructions, see the FAQ entry on telnet. For the executive summary, go to Start menu, choose Run... option, type in "telnet 10.0.0.1" and that will open up the Windows Telent utility and attempt to connect with 10.0.0.1 (which is EFficient's default IP for the modem). If you time out here, you must go to your Network control panel in Windows and set your NIC's IP to 10.0.0.x (x=any number between 2 and 255 but not 192) and your subnet mask to 255.255.255.0. DO NOT USE 10.0.0.1 as your NIC's IP! Then try again.
4. If you have more than one firmware file, decide which firmware you want to flash. (If you only have the official Efficient firmware, you're out of luck here.) In the interests of safety, I recommend you flash version 2.1.0 first. It is an older version, but some 5260 modems unfortunately are provided with a smaller memory size compared to "real" 5660's and as such they can only be upgraded once to a newer version before running out of memory. Once you have successfully flashed 2.1.0 you can decide whether to upgrade to 2.3.0(6) or just stick with 2.1.0, which you can do if you only need PPPoA or DHCP support. If you only have a 2.3.0 revision, there is no need to worry, as one 2.3.0 can be upgraded to the next. But avoid an obsolete 2.2.x version at all costs!
5. Now you need to flash the firmware. Type "firmware" into the speedstream command line. It asks you for the IP address of the FTP server, login, password, and path (location). Enter the username, password, filename. Just use the name of the image file if you specified the proper directory in your FTP server program. The simplest thing to do is set the speedstream user's home directory to your firmware's directory on your hard drive, and then tell it the location is just the firmware's filename. If you have a problem where the FTP transfer to the speedstream cuts off after a short time or times out immediately, try setting the modem and/or your NIC to half-duplex mode first.
6. Your modem will now reboot. When it comes back up, use your web browser to visit 10.0.0.1 and try to keep your jaw from falling onto the floor in disbelief. YOU HAVE TURNED YOUR 5260 INTO A 5660. "That's not a moon. It's a space station!" - Star Wars
7. If you want the nifty new features that router mode can bring you, you must switch your modem into "router mode". First, you will want to go to your Network control panel and change your NIC's TCP/IP setting to "obtain IP address automatically" then set the default Gateway to 10.0.0.1 and enable DNS and set your DNS server to 10.0.0.1. Please note that the 5660's DNS server is rather unreliable, and you may get improved results by simply adding your ISP's DNS servers to the DNS server list in your Network control panel.
8. To quickly set the router up to be your PPPoE client device (meaning no more Enternet, WinPOET, or RasPPPoE!!) and router, at the web configuration interface do "simple setup", use the default values for VPI/VCI (which should work fine), enter your username and password for your internet access account. Then reboot the router. Then reboot your computer. Your computer will now use your router as a DHCP server to get an IP, which defaults to 10.0.0.2.
All done! No more stupid PPPoE software clients. No more personal firewall software, unless they amuse you. Yay!