The AA65 is a legacy device that will not work well with 6.x software. Updating will cause performance issues as 6.x requires more hardware resources. We recommend not going past 5.11.1
This is due to a lack of processing power and resources in the Switchvox AA65 System. 6.x uses more resources and will cause heavy lag on a Switchvox AA65 system even after upgrading base RAM.