Upgrade the firmware following these instructions:
Download the disk image to your computer and mount it by double clicking.
Start "EKS Otus Firmware Update".
Select the Otus you want to update from the list. If you have several Otus controllers connected, pressing "Identify" will make the lights around the wheel of the selected controller light up.
Press "Continue". While the update is in progress, do not turn off the computer or disconnect the controller.
When the firmware update is complete, disconnect the updated controller to apply the changes.