That device stopped (officially) at Lollipop so chances of official Nougat support are zero.
As for BT 5.0 - there would also need to be support on the chip for it, there likely isn't since BT 5.0 was in the infancy of pre-beta at the time the device was built.
I'm running Nougat on mine via a third party ROM. works great. I haven't checked the Bluetooth version but it's not 5 as the hardware couldn't possibly support that.