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Knowledge document #541
This support document is available for the following products:

Installing the latest FRITZ!Fon software

AVM provides free updates for the FRITZ!Fon on a regular basis that add new functions to the telephone. You can easily install the latest software using the FRITZ!Fon menu.


  • The FRITZ!Fon must be registered with a FRITZ!Box.

1 Preparations

The software version indicated by your telephone depends on the version of FRITZ!OS installed on the FRITZ!Box. Therefore, install the latest FRITZ!OS for the FRITZ!Box and register the telephone with the FRITZ!Box.

Installing the latest FRITZ!OS for the FRITZ!Box

  1. Install the latest FRITZ!OS on the FRITZ!Box.

Registering FRITZ!Fon

2 Installing the latest software

  1. Press the "Menu" key on the telephone.
  2. Scroll to "Settings" and press "OK".
  3. "Software update" or "Software version" > "OK"
    • The telephone checks for a new version.
  4. If a new version is found, press "OK".
    • Now the new software is transmitted to the telephone. The update is complete after the telephone has restarted.