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Update for DSL and cable Fritzboxes improves Internet and system

The Berlin router manufacturer AVM regularly releases updates for its Fritzboxes and other Fritz devices. This includes repeaters, powerline adapters, but also Fritz phones. atechbook has the information about the latest updates.

AVM has a whole range of different devices on offer, most of which have been supplied with new firmware updates for years. The updates bring numerous innovations for the Fritzboxes, repeaters and powerline adapters, but often also solve minor problems. In the run-up, the company usually prepares the so-called release candidates for the current major Fritzbox update by means of a laboratory. New functions also continue to be tested through smaller updates from the Fritz lab. Here you can find out for which devices AVM currently offers an update.

Please note:

In the list, we include updates to the official Fritz!OS as well as the latest lab versions. Since AVM is only testing new features in the Fritz Lab, the software may cause minor problems in operation. Therefore, please pay attention to the notes we give on installing a Fritz Lab.

Overview of current Fritzbox updates

Lab update for DSL and cable Fritzboxes

AVM is rapidly approaching the release of the next major Fritz!OS. However, until 7.50 is ready, the router manufacturer is testing the new functions in various lab updates. One such update is currently available for numerous DSL and cable Fritz boxes. The update includes numerous adjustments and optimizations.

A total of five different Fritzboxes get the update – the DSL models Fritzbox 7590 AX, 7590 and 7530 as well as the cable routers Fritzbox 6660 Cable and 6591 Cable. The changelog, which lists all the new features of the Fritzbox update, contains the same points in each case. There are not only changes to the system, but AVM has also improved various points in the area of Internet and WLAN. This includes bug fixes for parental controls and Wi-Fi guest access, improvements for selecting the Wi-Fi frequency band, and stability improvements for VPN connections via Android devices. These are the innovations in detail:


  • Fixed The ICMP identifier for ping calls was sporadically set to 0 by the FRITZ!Box, making “host monitoring” more difficult.
  • Fixed Calling a list in an access profile of the parental control started the print view
  • Fixed After importing and using a simplified WireGuard VPN setup for company dial-in to a FRITZ!Box (as home device), no access from the company network to the FRITZ!Box was possible
  • Improvement Stability improvements for (Android) VPN connections via IPSec IKEv2.


  • Fixed When disabling the 2.4 GHz frequency band on the “WLAN / Radio Channel” page, the WLAN standard setting was reset
  • Fixed When MAC address filter was enabled on the “WLAN / Wireless Network” page, login attempts were not always logged in the “Show unsuccessful login attempts” list
  • Fixed Push service for WLAN guest access did not work
  • Improvement In case of a temporary channel change to channel 36 during ZeroWaitDFS (5GHz band), a corresponding entry was added to the event log (7590, 6591)


  • Fixed Call of direct help to event messages was not linked

The new features in the current FritzOS

With the latest Fritz!OS, AVM says it delivers numerous new functions and optimizations for its Fritz devices. These should not only increase the performance of the Fritzboxes, but also improve WLAN connections from mobile devices, enable faster and more stable connections via VPN networks, and provide more security in the home network. Overall, AVM is introducing innovations in all core areas such as Internet, telephony, smart home and home network.

Read the linked news item to find out which adjustments and features are included in the update to Fritz!OS 7.25 and higher.

Fritz Lab: What you need to know

If an update comes from the Fritz Lab, different conditions apply compared to the official updates. This is because AVM uses the lab firmware to test new functions that will later become part of the large, official firmware update at the end of August or beginning of September. It therefore has beta character. The manufacturer also points out that there may be problems when operating the software.

Users can try out a Fritz Lab if the current FritzOS is installed on their Fritzbox. Before installing the software, however, the data and settings on the router should be backed up to be on the safe side. Once this has been done, users can download the Fritz Lab firmware from AVM’s website and save it on their computer as a ZIP file. After unzipping the file, the following steps are then necessary for installation:

  1. Call up the Fritzbox interface in the browser with and enter the password for your Fritzbox if necessary.
  2. At the bottom of the menu you will find the footer “View: Advanced”, which you have to activate
  3. Now you will find the tab “FritzOS file” under “System / Update”.
  4. Select the path to the previously downloaded and unzipped ZIP file in the input field and click on “Start update”.

If a lab firmware is already installed on the Fritzbox, a new update will be offered automatically. Note that the update process may take a few minutes. During this time, the router’s info lamp flashes. Once the update is complete, the Fritzbox restarts automatically. Data and settings are not lost, so the router is ready for use again as usual.


  • Fritzbox
  • Router