But if i try NR-CA modem will crash totally after short while. probably there is a compatibility problem or a firmware problem between the router and the modem card.
Router is Mikrotik LHGG.
I see you have the EU model of the RM520. I have the GL version but also have been experiencing issues with b28 and b78 together with CA. I’m not an expert on such things nor was I experiencing crashes, maybe however you might find something helpful with my findings reported in RM520N-GL firmware issues (bugs) in latest release.
I don’t know if it was a good option to choose the EU version or if the GL version would have been better.
At least there have been no new firmware versions for the EU version, so I don’t know if the modem supports how well SA orders in Finnish networks.
It may be that the settings are not quite right yet, but you have to try to test and search for optimal settings.
I have one version newer firmware on my laptop but waiting good moment to test upgrade modem card firmware