Users can download the firmware into the CAN-8424 as following steps: 1. Power-off the CAN-8424 2. Rotate the DR switch to '9' 3. Install the download cable between COM1 of the CAN-8424 & COM1 of PC 4. Power-up the CAN-8424 & Run 7188xw.EXE 5. Then press F4 button to load firmware automatically. PS: the firmware files are "DN_44XXX" and "autoexec.bat". These two files and the 7188xw.exe must be in same directory. 6. Rotate the DR switch to the necessary DeviceNet baudrate 7. Then Key-in “reset” to restart the CAN-8424 8. Pressing Alt & X at the same time will quit the 7188xw.EXE