Three years ago ISP locking and obligatory routers were abolished by law in Germany. This means users are free to choose the end device they want for their internet connection.
> https://en.avm.de/router-freedom/
Generating support information To process your request, we need the support information from your FRITZ!Box. You can use the FRITZ!Box user interface to send us the support information. The support information is encrypted with TLS and transmitted using a randomly selected port. Send the information while or immediately after the error occurs. Do not perform a restart before sending the support...
> https://en.avm.de/service/generating-support-information-for-the-fritzbox/