FRITZ!Box 6840 LTE Service - Knowledge Base

FRITZ!Box 6840 LTE Service

Wireless settings cannot be changed

The FRITZ!Box's wireless settings cannot be changed. This means that you cannot save a new wireless key or disable the MAC address filter, for example. When you click "Apply", the previous settings are displayed again.


  • The web browser settings are preventing a pop-up window from appearing in which the changed settings are displayed so they can be printed. The FRITZ!Box does not save the new settings for security reasons.

1 Adjusting the web browser settings

  • Configure your web browser to allow pop-up windows from the FRITZ!Box user interface:
    • Google Chrome
      1. Click the button (Customize and control Google Chrome) on the top right of Chrome.
      2. Click "Settings" and then "Extensions".
      3. Click "Options" for the pop-up blocker you are using.
      4. Enter as an exception and close the "Extensions" window.
    • Mozilla Firefox
      1. Click the (open menu) button on the top right of Firefox.
      2. Click "Options" and then "Content".
      3. Click the "Exceptions..." button next to "Block pop-up windows" option.
      4. Enter under "Address of website".
      5. Click "Allow" and then "Close".
    • Microsoft Internet Explorer
      1. Click the button (Tools) on the top right of the Internet Explorer.
      2. Click "Pop-up Blocker" and then "Pop-up Blocker Settings".
      3. Enter under "Address of website to allow".
      4. Click "Add" and then "Close".