Sagemcom F@st 2404 Original Firmware

Greetings, future me or anyone else who may stumble upon this message.

Have you encountered the unfortunate situation of being compelled to use a Sagemcom F@st 2404 ADSL modem? Perhaps you were daring enough to install OpenWRT on it, only to realize that you lack the necessary 3.3V serial cable to proceed past the “firstboot” screen.

Fear not, for Uncle Dimme once again comes to the rescue! No need to delve deep into the abyss of scouring Tunisian telecom-company forums in search of the original firmware.

Here’s a simple solution for you:

  1. Download the Original Firmware from here ( and unzip it – hooray!
  2. Press and hold the reset button on the modem.
  3. Power up the modem while continuing to hold the reset button.
  4. After approximately 20 seconds, observe the power LED turning red, and then release the reset button.
  5. Connect an Ethernet cable and manually configure your PC’s IP address to
  6. Open your web browser and go to, then proceed to flash the firmware.
  7. Allow a minute for the process to complete.
  8. Reboot your router using the web interface.
  9. Embrace the joy of your less-than-stellar, sluggish ADSL internet.

May your online ventures be filled with perseverance and patience!

Telia Sagemcom and

If you are unfortunate enough to have been given a Telia WiFi router model F@st 5370e made by Sagemcom, you may have experienced that IP is unreachable. [1, 2, 3] is a public DNS server provided by Cloudflare that many of us prefer to use, instead of, let’s say, Telia’s own snooping DNSes or Google’s Of course, an alternative is to use, which also provides the same service by Cloudflare, but where is your backup DNS in that case?

The reason it is unreachable is that the router is using this IP internally for an interface called “IP_BR_LAN_LXC“. LXC is a userspace interface that can be used to create and manage application containers.

You can disable the “IP_BR_LAN_LXC” interface by following the instructions given below:

  1. Login to you router’s “admin” (sic) interface by browsing to
  2. If you’re using Firefox or Chrome, press “F12” and navigate to the “Console” tab.
  3. Enter the following command and press Enter: $.xmo.setValuesTree(false,"Device/IP/Interfaces/Interface[Alias='IP_BR_LAN']/IPv4Addresses/IPv4Address[Alias='IP_BR_LAN_LXC']/Enable");

That’s it, should now be reachable. I have not experienced any issues by disabling this interface. Maybe I’ve blocked Telia from using some remote tools to mess with my router? I call this a win in that case. If for some reason, you want to reverse the setting above and re-enable this interface, you can do so by typing the following command into the console:


Bonus: While you’re at it, block and from your network. Reason? Android, and in general Google devices, are using this DNS regardless of your DHCP settings. You can block them by going to this hidden path in your router and adding and

PS: You can either change the DNS servers on a per-device basis, or you can change the DNS servers that your DHCP server is announcing to your local network. This can be done using the following hidden URL:

DISCLAIMER: I don’t take any responsibility for any of your actions blah blah blah…