Hello. I'm using a Flint GL-AX1800 (v4.5.16) with a GL-M2 and the 5g module (RM520NGLAAR01A07M4G).
When opening the Internet/SMS, it just shows 'No message'.
Using AT commands (AT+CMGF=1 and AT+CMGL="ALL") I can read the text messages.
I noticed that SMS_manager and smstools3 are stopped and do not start even if I try to start them manually.
That's because the script /etc/init.d/sms_manager will check if the modem is built-in.
Not sure if the program will work with a modem via USB, but this line will make it work:
sed -i '/if \[ ! -f \/proc\/gl-hw-info\/build-in-modem \]; then/,/fi/d' /etc/init.d/sms_manager
sed -i 's/bus=$(get_modem_bus)/bus=`get_modem_bus "usb"`/' /etc/init.d/smstools3
/etc/init.d/sms_manager start
/etc/init.d/smstools3 start