We will flash SIM800H firmware to this module, firmware download link:
We download this firmware:
SIM800L Module Pinout:
Connection: ( Here, I power it with 3.7V lithium battery, you can
power it with DC power supply too)
SIM800L CP2102 3.7V battery
GND GND Negative
Note: RST need connect with switch and negative of battery
After connected, the blue LED of the SIM800L will blink fast.
Flash tool download link:
After download, please install flash tool:
Open flash tool, and make setting as below and choose the firmware file :
About the COM port, please check it in your computer’s device manager.
Click Start Download, then press the switch, it will begin to download
It need download several files, and will take a few minutes
When downloading, the TX and USBGND LED of CP2102 serial port module will turn on, LED of SIM800L will turn off.
If you see this message, just click OK
Once click OK, it will show this, that means success.
Remove RST cable and open serial port software, you can send ATI and AT command, then you will see below message:
Firmware download link: (please download SIM800H)
Note: If this firmware can not flash success, you can download other firmware and try.