Click the appropriate download file above. A dialog box will open, asking if you want to save or open the file. Choose “Save As”. In XP and Vista, save it to your desktop (this makes it easy to find). In Windows 7 or 8, the file is saved in your “Downloads” folder.
In XP and Vista, double click the file on your desktop to unzip the file. In Windows 7 or 8, go to your Downloads folder and extract the file (you will normally have to right click on the file and select “Extract All ”). Drag the extracted upgrade file to your desktop.
Plug in your USB flash drive. The drive window should open. If not, go to “My Computer”, and open it (should be “Removable Media” drive).
Drag the file named s4xxV00x-00 upgrade.w400 to the USB drive. (Make sure that the Upgrade files are the only files on the drive.)
Unplug the USB flash drive from the computer.
Now you can upload it to your controller:
Note: If you have the U option, the software upgrade will erase the datalog files. Before performing the upgrade, save your datalogs to the memory stick.
Upload the file to your controller:
Plug the memory stick into the USB Host connection on the controller's front panel.
Scroll through the controller's menu until you reach the "Upgrade" menu item.
Press the Enter key to get to the "Start Upgrade" menu item.
Press Enter again to begin the upgrade.
The controller will display the progress of the file import process. If successful, the controller will display "Transfer Success" and the controller will automatically reboot.
Note: If you have the U option, the software upgrade may create a new configuration file. If you have previously saved the configuration file, you should discard the old copy and export a new copy after performing the upgrade.