Hello! Thank you very much! I tried to get these files in LINUX myself, but it's still difficult for me. Too many new things. Thanks again for your help!
it is a real issue to get / compile the "unsquashfs4-avm-be".
It is open source and in my opinion, it would make sense to make the program available precompiled and downloadable somewhere.
At least in this chat.
DSL firmwares extracted from FRITZ.Box_7490 firmware version 07.57
unsquashfs compiled from freetz-ng tag:ng23080 in Fedora 37.
Someone should really compile a Windows exe version of this unsquashfs.