# Updating Controller Software

Updating and switching controller software are two different tasks that are tightly connected. The controller can have two different software versions installed, one active version and one passive version. It is a simple process to switch between the two versions. Switching controller software is the task that switches active and passive software.

## Loading New Software to the Controller:

1. Select the System administration tab .

2. Go to Controller software and data management .

3. Select the check box of the controller. It is only possible to update the controller software if the controller is online.

4. Select Software then Software update from the drop-down menu.

   The Software update dialog window opens.

5. Select Open file and browse the selected file.

   The file name should end with -px2it.zip

6. Mark the file and select Open.

7. The file path is shown and the button Software update is active. Select the button to start loading the software.

If the controller application fails to start repeatedly the controller will boot up in rescue mode. In rescue mode a new firmware can be installed. The rescue image is distributed with the software update and can be updated if a newer rescue image exists.

Do not power off the system during rescue image update. The system will reboot when starting the update.