We do not provide customer support via Facebook or Twitter.I've made numerous attempts to contact DiveNav over the past 2 weeks, using various forums (email, DiveNav support forums, Twitter, and Facebook), and have yet to receive any sort of acknowledgement..
We got your email.
Unfortunately the Android echosystem is not as uniform as the iOS one and different manufacturers interpret and implement standards in different ways.
Bluetooth 4.2 implementations should be backward compatible with 4.1 and 4.0.
Apple does it.
Some Android vendors do not.
Get a different phone.