To upload the firmware files issue the xmodem command. After issueing the xmodem command you should see C 's appearing after the command indicating the card kan zijn ready for the file transer: f860Bug> reset :h ; loadf full_path/bootMonitor.ROM 0x100000 Initializing memory controller and UPM for 50MHZ DRAM delay https://scheepsshop.nl/navigatie-en-elektronica/sensoren/bootmonitor-met-bilge-wacht.html