The AP zone will support all the AP firmware, the SmartZone was installed in and upgraded to, along with AP patches (if installed in SZ).
Here is an example:
- A new vSZ instance is installed in version 18.104.22.168.250, it was upgraded to 22.214.171.124.496 & then to 126.96.36.199.1161. Now the AP zone will have option to upgrade/downgrade to 3 AP firmware from 188.8.131.52, 184.108.40.206.496 or 220.127.116.11.1161.
Please let me know if you have queries.