Originally Posted by Vlad83
I think the main difference is that T-Mo released this update to enable Wi-fi calling which is presumably reflected in the radio as well as the framework. Other changes if any, are unknown...
It just sucks that wi-fi calling works on the stock rom only...
No it doesn't, works great on ViperOne 7.
I flashed 6.09.401.5 firmware, which has a 4T.29 radio, a while ago. Just flashed the one posted (4T.28) and i'll see how it goes. The 4T.29 radio I had is working fine, LTE in most places, and speeds are fine.
And wifi calling works great, I don't think it has anything to do with the radio.