This is a relatively easy question, because the guys @ Digi decided to make it simple to update X-CTU's firmware "library" via some built in updater.
- Open X-CTU
- Navigate to the Modem Configuration tab
- Click on the "Download New Versions....." button
- Click on the "Web" button (This will download any firmware updates that aren't already in your X-CTU library)
- Connect a Digi radio to your PC via USB or Serial connection
- Open X-CTU and make sure you select the appropriate baud rate and COM port
- Navigate to the Modem Configuration tab
- Click on the "Read" button (This will populate the white space below with all the parameters applicable to the radio. It will also populate the 3 drop down menus that are located about 1/3 of the way from the top of the window. The drop down menu on the right is where you will see new versions of the firmware.)
- Select the version you wish to update to from the right-hand drop down menu, put a check mark in the "Always update firmware" check box.
- Click on the "Write" button. (You should now see a progress bar along the bottom)
- Once the firmware is written, you will see a completed status where the progress bar was. Now click on the "Read" button and look to see if the new firmware version appear in that right-hand drop down menu.
- Your done!