Problem with GPRS shield (no communication at all)

Products & Technology Shields
27

Hello everyone;

I got the GPRS Shield some days ago, and I’ve just tried everything to communicate with it through serial. I do not have Arduino but I also bought the UartSbee V4,

  1. I wired my Uartsbee pin RX with GPRS pin 7 (D7)RX, then UartSbee TX pin with GPRS pin 8 (D8)TX, my GPRS shield jumpers was as SWserial mode.
    then I fired up my terminal and my GPRS shield with 5 volts power supply and wait until Netlight started blink each 3 seconds and the status led was in red. In the terminal session I started with 19200-N-1 and I typed AT, without response, then I switch to 9600-N-1 and all the bauds available obviously with Carriage Return.

  2. I tried to update the firmware of the Sim900 as jimbo.we suggested with simcom tool and I got exactly the same issues as guans screen shoots.

  3. I could not in SWserial mode so I set the jumpers in Xduino mode and I wire my UartsBee pin RX with GPRS pin 0 (D0)TX, then UartSbee TX pin with GPRS pin 1 (D1)RX, I tried all baud rates XXXXX-N-1 carriage return, and again no response from my GPRS Shield.

4.Finally I reset the SIM 900 chip directly with low pulse (ground) in pin number 16, I was sure that now everything going to be fine but the GPRS behaivor was exactly the same

I spent about 9 hours trying everything to figure my issues out without success, I’m really upset and I do not know what were wrong I think my GPRS Shield is damage, or Do I miss something?

My other question I ’ m not sure is my SIM is unlocked, but anyway according to me, the GPRS should reply either if it does not have a SIM attached, I mean it wont send SMS message but at least the shield has to reply an AT command with OK.

please guys I’ll appreciate any advice, please I need your help I 'm feeling really frustrated.

thanks & best regards