1. Prepare the software for serial port communication

    Install minicom utility using your Linux distribution package manager and configure it. Consult with howto if troubles.

  2. Upload the firmware via xmodem

    When minicom session is active press the hot key Ctrl+A, then press S and select xmodem in context menu:

    xmodem

    Input full path to the file:

    Select file for xmodem

    Press Enter and wait for upload to finish:

    Uploading via xmodem

  3. Upload the firmware via ymodem

    When minicom session is active press the hot key Ctrl+A, then press S and select ymodem in context menu.

    Input full path to the file and press Enter. Wait for upload to finish.