Switchvox - Can I Rollback An E-Series Appliance To Run On Version 5.x of Switchvox?

No, unfortunately, you cannot install version 5.x or any early version of 6 on the Switchvox E-series appliances. They come loaded with version 6.4.2 which is required to support the hardware. When migrating from an old appliance to the E series, it is necessary to update the older system to 6.4.2.