Enable LTE bands in US

Try *#*#4636#*#* which should show you network types available and if your lucky set the one you want

I see that LTE is an option here; but the radio picks nothing up. This phone comes from the factory stamped on the box with LTE bands 3/7/20 enabled.

Perhaps I should rephrase the question:

Does editing the NV values do anything, or is the radio hardware limited to specific frequencies? Or is there a way to flash a ROM or something that's not editable (i.e. via QXDM) to fix this problem? It seems like the chipsets are all the same from phone to phone, so something 'soft' must be limiting the band selection.

I'd hate to have to buy another phone simply for the fact I'm limited to 2G connectivity. I love how the government and cell phone manufacturers have the consumer's best interest in mind.

So I purchased this phone while in the UK because it looked like a solid item. Unfortunately, I neglected to realize that the default LTE bands were EU and the phone will not work in the US other than on 2G.

In the meantime... I've spent the entire day setting up the appropriate tools to modify the NV values in 6828/29 to enable the appropriate LTE bands (2,4,12) for my carrier here in the US. I've wrote these values successfully, however, no LTE. These are the only two NV values I've modified.

Is this possible? Or is there something I'm missing here and the phone chipset/radio is not configurable in this manner and requires either some other attention, or that I'm screwed.

Thanks for any insight.