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Dokument informacyjny #257

Installing an older FRITZ!OS (downgrade)

The latest FRITZ!OS offers new and improved functions and resolves known issues. We also continuously adapt and improve security functions to take the latest requirements into account, so you are also protected against new, potential threats. This way, the latest FRITZ!OS ensures maximum security in your home network.

With the last FRITZ!OS update, a root certificate in the FRITZ!Box necessary for communication with AVM services, such as MyFRITZ! and push service notifications for FRITZ!OS and FRITZ!Apps, was updated. These services can no longer be used after a downgrade.

It is possible to reinstall an older FRITZ!OS (downgrade), but we do not recommend it for these reasons. Nevertheless, you can use the recovery program to install an older FRITZ!OS, which deletes all of the FRITZ!Box settings.


  • Windows 11 / 10 / 8 / 7 is installed on the computer.

1 Saving data from the internal memory

This procedure deletes the internal memory. You should therefore save all of the data that you still need first:

  1. Click "Home Network" in the FRITZ!Box user interface.
  2. Click "USB / Storage" in the "Home Network" menu.
  3. If the storage (NAS) function is enabled, click the internal storage to display the contents of FRITZ!NAS.
  4. Select the files and folders you want to back up.
  5. Click "Download" and save the file "" on your computer.

2 Downloading the recovery program

  1. Call up in a web browser.
  2. Switch to the folder for your FRITZ!Box model.

    Note:The complete model name of your FRITZ!Box is shown in the FRITZ!Box user interface on the "Overview" page and is also printed on the sticker on the bottom of the device.

  3. Download the file with the file extension ".exe" to the computer.

3 Connecting the FRITZ!Box with the computer

  1. Use the network cable included with delivery to connect the computer directly to a LAN port on the FRITZ!Box.
  2. Clear all other connections between your FRITZ!Box and network devices or USB devices.

4 Disabling firewalls

ATTENTION!Only disable firewalls to run the recovery program and re-enable them before connecting to the internet. This software protects your computer from attacks from the internet and prevents other threats (for example computer viruses) from being executed.

  1. Disconnect the FRITZ!Box from the internet and do not reconnect it until the firewall is restarted.
  2. Configure all firewalls on your computer (for example, Zone Alarm, Norton Security) so that they are not automatically re-enabled when your computer restarts.
  3. Close any active firewall applications.
  4. Disable the Windows firewall:

    Windows 11 / 10

    1. In the Windows task bar, click (Start) and then "Windows Security" or "All apps" and then "Windows Security".
    2. Click "Firewall & network protection" in the menu "Windows Security".
    3. Click on the active network (normally "Private network").
    4. Disable the Microsoft Defender Firewall.

    Windows 8

    1. Press the keyboard shortcut Windows key + X and select "Control Panel" from the context menu.
    2. Click "System and Security" and then "Windows Firewall".
    3. Disable the Windows firewall.

    Windows 7

    1. In Windows, click "Start" and then "Control Panel".
    2. Select "Category" from the drop-down list "View by:" on the top right ().
    3. Click "System and Security" and then "Windows Firewall".
    4. Disable the Windows firewall.

5 Running the recovery program

  1. Run the file "fritz.box_...recover-image.exe" and click on "Next".
  2. Follow the instructions.

    Note:It is not an error if the program does not search for the FRITZ!Box under its IP address, but under a different IP address instead. This does not affect the process.

  3. If you are asked to do so, select the network adapter that the FRITZ!Box is connected to. Normally the correct network adapter is already selected.
  4. If the program displays an error message such as "Recovery failed due to an error", run it again. If recovery fails after several attempts, run the recovery program on a different computer.
    • If the recovery program displays the message "Complete - FRITZ!Box successfully restored!", recovery was successful.

Now the older FRITZ!OS is installed. To ensure that the latest FRITZ!OS is not installed automatically, you may have to change the settings for the auto-update function under "System > Update > Auto Update" and "Internet > Account Information > Provider Services" in the user interface.