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.