In an emergency, you can still try the AVM recovery tool.
https://ftp.avm.de/fritzbox

Hello,

Thank you for your enquiry to FRITZ! support.

These instructions describe how you can load the factory settings of your FRITZ!Box 4060 without a telephone:

https://fritz.com/service...

If you have any further questions or require assistance from our technical support team, please contact us by e-mail at fritzhilft(at)avm(dot)de. Please state the ticket ID #6987144 in your enquiry so that we can allocate your support ticket more quickly.

Kind regards from Berlin
Your FRITZ! team

This is only possible without a phone via the web interface (System / Backup / Factory settings)