FRITZ!Box 6810 LTE Service - Knowledge Base

FRITZ!Box 6810 LTE Service

"Info" LED or several LEDs flash constantly

The "Info" LED or several LEDs flash constantly and the FRITZ!Box freezes.

In this case

  • you may no longer be able to open the FRITZ!Box user interface (
  • only a white page with the error message "firmwarecfg: ERROR Error: opening page ../html/index.html" may be displayed in your web browser.


  • A manual or automatic FRITZ!OS update failed.

Important:Some of the settings described here are only displayed if the advanced view is enabled in the user interface.

Simply proceed as described below. After each measure, check whether the issue persists.

1 Preparations

The following preparations are necessary for the measures below. They always must be carried out:

Restarting the FRITZ!Box

  1. Unplug the FRITZ!Box.
  2. Plug the FRITZ!Box back in after about 5 seconds.

    Note:The FRITZ!Box settings remain intact. The restart will take about 2 minutes. During this time, you cannot access the FRITZ!Box.

Clearing the cache of your web browser

Clear the cache of your web browser:

  • Google Chrome
    1. Click the button (Customize and control Google Chrome) on the top right of Chrome.
    2. Click "More tools" and then "Clear browsing data...".
    3. Select "the beginning of time" in the "Clear browsing data" window.
    4. Select "Cookies and other site and plugin data" and "Cached images and files".
    5. Click "Clear browsing data".
  • Mozilla Firefox
    1. Click the (Open menu) button on the top right of Firefox.
    2. Click "History" and then "Clear Recent History".
    3. Select "Everything" and click "Clear Now".
  • Microsoft Edge
    1. Click the button (More actions) in the top right corner of Edge and then click "Settings".
    2. Click "Choose what to clear" under "Clear browsing data".
    3. Enable the option "Cached data and files" and click "Clear".
  • Microsoft Internet Explorer
    1. Click the button (Tools) on the top right of the Internet Explorer.
    2. Click "Internet Options" and then "General".
    3. Click the "Delete" button.
    4. Enable the option "Temporary Internet files" and click "Delete".
  • Apple Safari
    1. Click "Safari" in Safari's menu bar and then click "Preferences".
    2. Click "Advanced" in the settings and enable the option "Show 'Develop' menu in menu bar".
    3. Click "Develop" in the menu bar and then click "Empty Caches".
    4. Click "Safari" in the menu bar and then click "Reset Safari".
    5. Click the "Reset" button in the next window.

2 Checking whether the update was successful

  1. Open the FRITZ!Box user interface.
    • If the user interface still does not open several minutes after the "Info" LED has gone out:
      • Use the recovery tool to reset the FRITZ!Box. The recovery tool then installs the update.
  2. Check which FRITZ!OS version is displayed on the "Overview" page.
    • If the new version is displayed, then the update was successful.
    • If an old version is displayed:
      • Repeat the online update procedure.
        • If the online update fails, perform a manual update as described in the next section.

3 Resetting the FRITZ!Box

Saving the FRITZ!Box settings

Applying the recovery tool

Restoring the FRITZ!Box settings