# Serial Port Burning
The page is about the firmware update method of mx1270 series module.
This document is applicable to the. bin firmware burning of mx1270 series modules. Module models include: EMW3070, EMW3071, EMW3072, and EMW5070.
#Burn preparation
- A USB to TTL small board (for connecting out the debugging serial port)
- PC with SecureCRT software installed
- The module connects 6 wires, power and ground, user serial port TXD and RXD, BOOT pin and RESET pin.
#Burning steps
- Install the USB to TTL converter driver software on the PC, and enter the device manager to view the COM port of the serial device;
- Usually, Enhance COM is the debugging serial port
- Standard COM is usually the user serial port
- The PC side installs the SecureCRT serial port terminal software (opens new window) (opens new window) by itself, and connects the corresponding COM port debugging serial port. The baud rate is 115200bps, the data bit is 8 bits, and the stop bit is 1, as shown in the figure:
- The module BOOT pin is pulled down, RESET is reset, and the user serial port output information is as follows:
Enter the command: write 0xa000 Enter.
Open the Transfer -->Send Ymodem interface, and select the. bin firmware file to be burned in the PC directory, as shown in the following figure. Select OK to start burning.
- Wait until the burning is completed, and you can view the burning results, as shown in the figure:
- Confirm the firmware information:
BOOT is pulled up and RESET is reset, you can view the output information of the debugging serial port. In this case, the AT firmware outputs the AT log information, as shown in the figure:
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