Sim Card not ready LTE3301

Hi, I’m sure there are different resons for all of the above mentioned issues, but my problem seems very much identical. Altough I haven’t used the device for quite some time, as it stopped working (flashing the red bars), I now dug it out and started to figure out what the problem is. I have so far rebooted it, both quickly and to factory settings, installed new firm ware etc. And it keeps on showing that the sim card is not ready (even though it works on other devices)…

Is there a fix, or was my original investment a waste of money? It barely worked for a couple of weeks…

I appreciate all advice on the matter.