This modem require configuration loaded in order to work. One of the
options is loading Windows, waiting while it configure modem and then
restart.
Other option is described here: https://abarouski.blogspot.com/2016/07
/configuring-hp-lt4120-in-linux-as-i.html
This solution not yet in upstream (but I'm working on it).
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https://bugs.launchpad.net/bugs/1574582
Title:
HP lt4120 Snapdragon X5 LTE USB modem not recognized by network-
manager
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