Please use this link; it will take you to the WiNG-Man downloads area (first log in to the support portal). https://extreme-networks.my.site.com/ExtrProductDetail?id=01t2T000002kZbAQAU
There is no action in XIQ to just reboot APs, but you can schedule a 'complete configuration' push.XIQ - How to schedule a Complete Configuration Update
There is, however, that is proprietary and not available to the public. Your best bet is to factory reset AP. If it does not recover, please send it for RMA.