If the APs have a valid support agreement, then you should be able to download the firmware from the support portal per these instructions: https://extremeportal.force.com/ExtrArticleDetail?an=000083342
If the APs have a valid support agreement, then you should be able to download the firmware from the support portal per these instructions: https://extremeportal.force.com/ExtrArticleDetail?an=000083342