Voor het downgraden (op onderstaande manier) moet je waarschijnlijk eerst upgraden naar 39.04.43 beta (elders in dit topic te vinden) anders werkt het niet. Vervolgens werkt het als volgt (zelf even vertalen svp

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In order to downgrade, please apply the attached Recovery Tool. Using thisRecovery Tool is rather sophisticated, thus please read the following instructions carefully.
First of all, verify that the PC you will be using for recovery is connected to the FRITZ!Box via a "LAN" port. Secondly, the TCP/IP configuration of the network adapter used with this port is also of high importance. You will find the respective settings via Start > Settings > Control Panel> Network Connections > right-click the respective LAN connection >Properties > Internet Protocol (TCP/IP) > Properties.
The basic settings must look as follows:
* enable option "Use the following IP address"
* IP address: 192.168.178.x (x=2...251). Do not assign 192.168.178.1, as it is used by the FRITZ!Box itself
* Subnet mask: 255.255.255.0
* Default gateway: 192.168.178.1
* enable option "Use the following DNS server addresses"
* Preferred DNS server: 192.168.178.1 Now click "Advanced" and "WINS" On this tab enable the following two options: "Enable LMHOSTS lookup" "Enable NetBIOS over TCP/IP" Save the changes by clicking OK > OK > Close.
Please close any active firewall application on your system. If Windows XPService Pack 2 is installed on your system, the implemented firewall may also be active. Disable this firewall via Start > Settings > Control Panel> Windows Firewall. For security reasons you should disconnect the DSL cable as long as the security software is disabled.
1) Double-click the file FRITZ_BOX_...RECOVER-IMAGE.EXE. Click "Next".
2) When Windows reports that changes need to be applied regarding Media Sensing, click "Yes" and "OK". Windows will now reboot and launch the recovery tool again. In case the tool, does not start automatically, run the FRITZ_BOX_...RECOVER-IMAGE.EXE.
3) When the program prompts you to disconnect the power supply ("Disconnect power line"), remove the power cord from the FRITZ!Box and click "Next".
4) Reconnect the power cord when prompted by the red message "Please connect FRITZ!Box to the power mains now!".
5) Click the button "Next", once it is no longer greyed out.
6) If the program reports that the recovery has failed, repeat steps 2) to 5). It may be necessary to go through these steps up to 6 times!
7) When the program reports that the process was successful, you can close the program.
Since the recovery process restores the factory settings, you will have to re-configure your LAN connection respectively, e.g. setting the TCP/IPproperties to obtain the IP address, the default gateway, and DNS automatically. After another reboot, you should be able to launch the userinterface again via your browser by entering "fritz.box" or192.168.178.254.
Please note the recovery tool will delete all individual settings of theFRITZ!Box, e.g. Internet access settings, Internet telephony settings etc.
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Als je dit ziet zitten stuur je me maar even een PM voor de recovery tool.