Hey Artur, Aleksander,
I think your best bet is compiling .deb's based on source files
available from Sid:
https://packages.debian.org/sid/libqmi-glib5
https://packages.debian.org/sid/libmbim-glib4
https://packages.debian.org/sid/modemmanager
These are IIRC the latest release, or very close to. I managed to
successfully compile those against current stable (Bullseye) - they run
well. You'll have to compile them in that order, as usually don for
Debian packages, because of dependencies, and install respective -dev
packages to build the next ones.
Installing packages directly from Sid won't work, as required glibmm is
too new for Bullseye.
Kind regards,
Lech
