[Q] Add/unlock all global 4G LTE bands in HTC Desire 820 Dual Sim phone topic

Hi,

Can anyone Add/unlock all global 4G LTE bands in HTC Desire 820 Dual Sim phone?
Currently it supports only FDD 1, 3, 7, 8 and TDD 38, 39, 40, 41. So this phone can work in Asia and Europe but not in USA 4G network (e.g. AT&T or T-Mobile).

To work seamlessly in USA 4G network, the phone needs atleast the following extra 4G LTE bands:-
LTE FDD : 2, 4, 12, 20, 26
LTE TDD : 42

So can anyone add these LTE FDD : 2, 4, 12, 20, 26 and LTE TDD : 42 bands to this HTC Desire 820 Dual Sim phone ????
(Ref: http://forum.xda-developers.com/cros...ating-t2871269
Ref: http://forum.xda-developers.com/gala...ds-to-t2886059 )