An "Island" SSID in the air means you have isolated Mesh APs that can't reach the ZD. This is a temporary state as they repeat a reboot and trying to find it.
Here is the method to access the AP to try and recover it with a WPA-PSK.
1. Configure your laptop with a 169.254.1.x IP address (anything but .1).
2. Connect to the Island SSID, PSK = "ruckus-"
If your ZD's admin password is R&6Ku$, this psk would be 'ruckus-R&6Ku$' (without quotes)
3. Use putty to SSH to 169.254.1.1, login with ZD admin credentials, and
issue 'set director ip a.b.c.d' and 'reboot' commands, (where a.b.c.d is your ZD's
IP address)