@herbert.pan-Q
I have successfully upgraded firmware using package from you and QFirehose for Linux
sudo ./QFirehose -f RM520NGLAAR01A06M4G_12_001_12_001
But now my modem stopped registering in the network
ATI
Quectel
RM520N-GL
Revision: RM520NGLAAR01A06M4G
OK
AT+CFUN?
+CFUN: 5
OK
AT+COPS=?
ERROR
AT+COPS?
+COPS: 0
OK
AT+COPS=0
ERROR