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Knowledge document #3691

The signal strength LED on the FRITZ!Box flashes continuously

The signal strength LED on the FRITZ!Box flashes continuously. You may not be able to open the FRITZ!Box user interface any more and the browser only displays a white page with the error message "firmwarecfg: ERROR Error: opening page ../html/index.html". The reason for the flashing is either a malfunction of the FRITZ!Box or an unsuccessful update.

1 Preparations

The cache of the web browser must be cleared before you perform the following steps:

  1. Press "CTRL + Shift + Del" on the keyboard at the same time, or press "CMD + Alt + E" for Safari.
  2. In the new window, click "Clear" or press Enter.

2 Checking messages in the FRITZ!Box user interface

  1. Open the FRITZ!Box user interface. If the user interface is not displayed, continue with the next section.
  2. Check whether a message about a malfunction of the FRITZ!Box is displayed on the "Overview" page.
  3. If a message is displayed, click on the message and eliminate the cause.
    • If no message is displayed, the flashing is caused by an update. Continue with the next section to resolve the problem.

3 Restarting the FRITZ!Box

  1. Unplug the FRITZ!Box for 5 seconds.

    Note:The FRITZ!Box settings are retained when you unplug it. The restart takes about 2 minutes. During this time, you cannot access the FRITZ!Box.

4 Checking whether the update was successful

  1. Open the FRITZ!Box user interface. If the user interface is not displayed, use the recovery program to reset the FRITZ!Box. Using the recovery program installs the update.
  2. Click "System" and then "Update".
  3. Click the "Find New FRITZ!OS" button.
  4. The update was successful if no new version is found.
    • If a newer version is found, repeat the online update. If the online update fails, continue with the next section and update manually.

5 Updating manually

Downloading the FRITZ!OS file

  1. Call up download.avm.de/fritzbox/ in your web browser.
  2. Switch to the folder for your FRITZ!Box model, then to the subfolder "deutschland" or "other", and then to the folder "fritz.os".

    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 underside of the device.

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

Repeating the update process

  1. Click "System" in the FRITZ!Box user interface.
  2. Click "Update" in the "System" menu.
  3. Click on the "FRITZ!OS file" tab. If the tab is not displayed, enable the Advanced View first.
  4. Click "Save Settings" and on the FRITZ!Box, confirm that the procedure may be executed, if you are asked to do so.

    Note:Save your FRITZ!Box settings again under "System > Backup" right after successfully completing the installation. Then you can always restore a working configuration.

  5. Click the "Browse..." or "Choose File" button.
  6. Select the FRITZ!OS file you downloaded (image file).
  7. Click the "Start Update" button.

6 Resetting the FRITZ!Box

If a manual update is also not possible, use the recovery program to install the latest FRITZ!OS:

Saving settings of the FRITZ!Box

  1. Save the FRITZ!Box settings.

Running the recovery program

  1. Use the recovery program to reset the FRITZ!Box.

Restoring the FRITZ!Box settings

  1. Restore the FRITZ!Box settings.
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