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After I changed baud rate to fix 9600, the following thing continuously happens.
The problems that still happen: cannot register to network and AT+CGPSPWR=1 got reply "ERROR" with description "operation not allowed".
The module is powered on by 3.7V battery. It is connected to computer using...
Do you mean that I cannot use GPS functionality or turn on GPS if the GSM network is not registered? Then it makes sense because it seems to not able to register to GSM network. Both the GSM and GPS have antenna.
schematic
actually I bought the sim908 breakout. I sent the command from PC. other than that, the terminal received "GPS ready" after the module was powered on.
I bought sim908 breakout (https://www.open-electronics.org/localizer-with-sim908-module/) but without the breakout board which has microcontroller. I have connected VCC (pin 17, 19), GND (pin 18, 20), TXD (pin 12) and RXD (pin 14). The power (ON/OFF) pin is 1 but how to invoke the module to turn...
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