I would like to know if the cnpilot e400, e500, and epmp products support IPV6
Speaking for the e400/e500, the latest firmware does not yet support IPv6 addresses on the devices themselves, but I have no trouble using IPv6 on connected devices.
The ePMP firmware we use for WISP PtMP broadband now supports IPv6 for communicating with the device itself in Bridging mode (which also happily passes IPv6 traffic across the bridge), but if you put it in NAT/Routing modes it will not do IPv6 for connected devices. (I don't know about ePMP as a wifi AP but presume it's the same as bridging mode, where the device can be on IPv6 and clients can use IPv6 through it)
j