Is this an AOSv8 or AOSv10 deployment. If AOSv8, all APs need to be running the same firmware version. If it is AOSv10, then they can come up in different 10.x.x versions.
Where are you trying to push the upgrade from on the 505s? Like below? Pick your group ahead of time:

------------------------------
Dustin Burns
Lead Mobility Engineer @Worldcom Exchange, Inc.
ACCX 1271| ACMX 509| ACSP | ACDA | MVP Guru 2022
If my post was useful accept solution and/or give kudos
------------------------------