1] The default serial debug is on physical pins 1 and 2：

2] Connect the serial communication module to the pins of the Pico board：

(Serial communication module and Pico pin connection diagram;)

3] Use PUTTY to enter serial debugging：

(Note: The serial device number should be filled in according to the actual serial device number of the user.)

After configuring the serial port, you can successfully enter the system by inputting commands and receiving feedback results.

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Luckfox Pico RV1103【Use the serial port to log in to the system】