SIM900A flash firmware for Europe

Projects Networking, Protocols, and Devices
1

Hello,

I have a SIM900A mini v3.8.3 module, I want to connect it to an Arduino Uno to receive/send sms.
I connect it to my Arduino, following forum informations, I can connect to the SIM900A and send AT command.

I saw that the firmware was defined for Asian countries, so I flash the fimware with 1137B15SIM900M64_ST.cla file and SIM900 series tool dev 1.9.

Then I try so send AT command but nothing happen, my monitor is empty (baud rate: 9600).
I try other baud rates, sometimes some weird caracters appears but the connection seems to be NOK.

Do you know a correct version that could be used to restore my firmware or the latest software that should be used for Europe network?

I verify all my wires and I can't understand why the communication is NOK, I also test the communication, with a USB to TTL module and AI Thinker tool to send AT commands but I have the same issue.

Other information: when I finish to download the firmware, both leds are ON, when I try to send AT commands, both led blink at the same time every 1s.

I used a external DC 5V 2A alimentation.

Thank you for your help!

2

SIM900 is 2G and doesn't work everywhere. Have you confirmed your network supports 2G? Successfully sending AT commands is not confirmation.

3

Hello,

Thank you for your answer, indeed I need almost 3G GSM module... I'm located in France and I want to use a GSM module, only for SMS exchanges (domotic control needs), do you know wich GSM 3G/4G module is the most appropriate for my needs? Currently I don't need to send data, only SMS.

Best regards.

4

I don't know specifically, I'm in Australia, but check out the SIM7600xx family. I understand that they are the new norm.

5

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