If you factory default the AP, and login from your PC using default credentials, you can install any version/type of firmware,
Solo/Standalone or Unleashed.
Solo/Standalone mode firmware will connect to a ZoneDirector, SmartZone controller, or the Ruckus Cloud if you point them.
If your AP is running a Solo/Standalone version now, you can upgrade/install the latest Solo/Standalone image for your model AP.
https://support.ruckuswireless.com/products/79-zoneflex-r710#firmwares