GL-M2 SIM not registered

I have purchased a GL-M2 dev card in order to connect it to a GL-MT3000 router, and I have a problem.. I always get a "sim not registered". I tested the sim in a TP-Link 4g Router and it works perfectly. I tried with other sim from other company and the result is the same.

This is the screenshot I get:

I am updated to 4.7.4 firmware version, I have the right APN, the right PIN, the right autentication mode but I always get the same response. ¿Any clue?

It seems that the signal is relatively weak.

Is the feeder good connection between the m2 dev board and the modem module, as well as the external antenna?

Yes, the connection seems right. How can I check if the 4 antennas are working?

Hello @MrWahWah please ensure the IPEX cables and antennas are connected properly and firmly.

In addition, could you run this AT command and post the command output with us:
AT+CSQ;+CPIN?;+COPS?;+QCFG="USBNET";+QCFG="data_interface";+QENG="servingcell"

Thanks

This is what I get

+CSQ: 21,99

+CPIN: READY

+COPS: 0

+QCFG: "usbnet",0

+QCFG: "data_interface",0,0

+QENG: "servingcell","LIMSRV","LTE","FDD",214,07,449BB1F,108,6400,20,3,3,6FCC,-111,-20,-70,4,0,-,13

OK

Please run AT command AT+CFUN=0 and then AT+CFUN=1 to see if it works.
If still not working, can we have a remote check through Goodcloud:

Right now it is working. Maybe a saturation problem in this particular location.

Thanks for your time