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did you succeed in installation in Linux , fedora 34 or later?

There is a modem manager in fedora linux and I can see TRM250 there.

But it works for me but only as GSM/2g, not LTE/4g. (of course,  I have LTE enabled in sim - it works with my self phone)

kernel-5.17.4-200.fc35.x86_64
ModemManager-1.18.2-1.fc35.x86_64

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Hello,

TRM250 uses modem which supports following mobile standards:

  • 2G
  • NB - IoT;
  • LTE Cat M1.

Even though LTE Cat M1 is a part of LTE family of technologies, it is not the conventional LTE solution used for daily consumer needs. It is oriented to low power consumption, low data rate devices and applications usually related to IoT field. Due to that it might simply be incompatible with your carrier or data plan.

Does your carrier supply LTE Cat M connectivity?

Does your region have LTE Cat M1 coverage?

Does your SIM card support LTE Cat M1?

Best regards,

Žygimantas