i am not 100% if this is working. But i was able to switch Software between Unleased SW (not ZD manageable) and ZF SW (ZD manageable). Of course you need a License for your AP if you want to use it with your ZD.
I downloaded the ZF Version for this AP and did a factory reset on my unleased R500. After connecting to the unleashed provisioning SSID i did a Firmware Upgrade on the first screen and selected the ZF Version File i have downloaded. After doing so i had a AP who can be manged by ZD.