5. Trouble Shooting

5.1. Flash file system

• MicroPython REPL prompt is not displayed.

  • Re-program the MicroPython image file.

  • Confirm serial port connection. The connection must be crossed that the board TXD pin is connected with USB-serial conversion’s RXD signal pin.

  • If the prompt is not displayed suddenly, try to do factory file system boot mode as the final method. Please note that all files are removed forever.