An OptiFlow XR controller can be installed in the chassis that an ET PRO 3 was installed in. For details on how to replace an ET PRO 3 with an OptiFlow XR controller, click the link below.
Important note
You do not need to replace an ET PRO 3 with an OptiFlow XR controller in order to use OptiFlow on your site. You can upgrade your ET PRO 3 to OptiFlow using an OptiFlow Key. Keep in mind that an upgraded ET PRO 3 will not have the full level of OptiFlow capability that an OptiFlow XR controller will have. For information about how you can upgrade an ET PRO 3 with OptiFlow, click here.
ET PRO 3 to OptiFlow XR Replacement Installation Instructions