Hi Ian, I would recommend using 10.0r8 or earlier for all your devices for the moment. You can check this page to see what version of HiveOS (a.k.a. IQ Engine) works with which version of CloudIQ here: https://docs.aerohive.com/330000/docs/help/english/ng/Content/reference/docs/release-notes.htm?Highlight=126.96.36.199%20release%20notes
There is an IQVA release coming very soon that should let you use later firmware versions, just so you know to watch for that release. I’ve emailed you directly with instructions on how to get the firmware you need for your AP 650.