WE have made some progress,
First I want to say that what I show here has only been possible thanks to greasymonkey1960, smartpal, and Sr_Vash from htcmania.
Thank you a million pakidermo! I have been stalling to buy this device and following...
Another mirror here: https://mega.co.nz/#!fFVlDSaK!fAeo5iP5w65-Q_knGIKEOEFgkmF5ZDnRVwJzKlOWEdU
You know your rooted when you get superuser permissions to your wife!
Since using the German Firmware, I can use VoLTE and Wifi Calling.
Getting a HD Symbol while calling and still having Internet while only in LTE.
The Asian Firmware didn't got the option to activate it.
My provider is O2 (Tele...
I have tried (just to see if it works) running latest sunshine apk 3.5.5 with locked bootloader and apparently it has the potential to gain temproot and proceed to s-off locked state WITHOUT needing to unlock the bootloader via htcdev method....So...