- restart the switch and go to the boot menu
- press 7 for delete old operational code
- press 2 to change baudrate to 115200
- press 4 for xmodem
- go to File/Transfer/Xmodem/Send and select your firmware file ans starting the file transfer
- now you can cooking coffee and wait
- after the file transfer press 1 for loa the new code and than change the baudrate to 9600