I'm running 4.4.4 on a rooted Nexus 10. Is it correct that some of the later android OS revisions for Nexus 10 have enabled Bluetooth Low Energy? If so what is the earliest android OS to add this capability?
It's not a question of software. The hardware has to support it. Sure Andoid supported Bluetooth LE since 4.3 But not every device that has Bluetooth has automatically Bluetooth LE. And I think that the N10 doesnt have BT4.
The Nexus 10 does support BT LE as it has the hardware , it was not supported in the kitkat roms but there are fixes around including a pay for app on google play but it can be diy'd for free, lolipop roms do support it.