I gave a try and I can confirm that following the modemmanager docs to
enable FCC unlock procedure at ModemManager level, the modem is properly
unlocked and connects to the internet.

However, this is another issue, but the firmware crashing persist when
trying to make use of the LTE connection a bit more than just sending a
ping.

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Touch seeded packages, which is subscribed to modemmanager in Ubuntu.
https://bugs.launchpad.net/bugs/1949621

Title:
  modemmanager/libmbim cannot make use of Quectel EM120

Status in libmbim package in Ubuntu:
  Fix Released
Status in modemmanager package in Ubuntu:
  Fix Released

Bug description:
  As reported on https://gitlab.freedesktop.org/mobile-
  broadband/ModemManager/-/issues/402, this modem (shipped in many new
  Lenovo ThinkPad laptops) requires some specific handling as others new
  modems to performs FCC unlock procedure.

  A fix has been merged upstream: https://gitlab.freedesktop.org/mobile-
  broadband/libmbim/-/merge_requests/125/diffs

  Can we expect to see that merged in the current Ubuntu 21.10 ?

  I understand it might require a backport, since they merged it against
  1.26 and it does not seems to apply cleanly on 1.24. I also suspect
  upgrading libmbim to 1.26 is not acceptable for impish release.

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