Universal Robots UR5 Service Manual page 71

5. Service and Replacement of parts
1. Check that the software on the robot is not older than the firmware version on the SCB.
If the software on the robot is older, error C203A0 will be displayed.
The SCB firmware version can be found on the Ethernet connector.
This can also be found in the "About" menu.
Shortcut to "About", by clicking on the UR logo in the top right corner of the screen is
available from software version 3.2.18642
2. Shut down the controller and disconnect the power cable, open the controller cabinet then
carefully remove all plugs and connectors.
User Manual 65 UR5