Hi Sander,
So you have SZ/SCG/vSZ software on the AP instead of ZD software.
You can do the following
login to the AP and set to factory default with the set factory command.
Then login to the AP via webgui and use the upgrade option (then choose local file) to upload this file
https://support.ruckuswireless.com/software/1017-zoneflex-solo-access-point-104-0-0-0-1347-ga-softwa...After that it will reboot and will have the 104.0.0.0.1347 software, and you can use the set director to let it find the zonedirector.
Please download the file shortly as it only stays up for 1 week.
Kind regards
Martin