The staged status means that the AP is currently disconnected from the HiveManager so no updates can be pushed out to it, and that as soon as the device reconnects to HiveManager the update you are trying to push to it will go out automatically (unless you click cancel in the Configuration> Devices> Device Update Results screen). To get the AP reconnected to the HiveManager, you would want to follow the guide below, depending on the HiveManager Platform you are using.
HiveManager Classic (myhive.aerohive.com)- https://thehivecommunity.aerohive.com/s/article/CAPWAP-HiveManager-Classic
HiveManager (formerly NG, cloud.aerohive.com)- https://thehivecommunity.aerohive.com/s/article/CAPWAP-Guide-for-HiveManager-NG
