Well I got my AP's off the loop by pushing out the 2.8.0-241275 version. Tried the 2.9.0 and again bootloop so for now I'm back to 2.8.
ok after looking into this more I figured that the 2.9.0 version did not like the AP's having 2.8.0. So after I upgraded the vWLAN to 2.9.0-HA I was able to update the AP's to 2.9.0 also so all is good.
You are correct. The AP's and vWLAN are tightly coupled by version. In some cases they will reboot.
We do have plans to allow different versions in certain cases in the future to make this a better user experience. Let us know if you have anymore problems.
ADTRAN Product Support Engineering