[Verizon Motorola Droid Turbo Q&A, Help & Troublesh] ChazzMatt:
There's 3 tutorials floating around, for Qualcomm Snapdragon. One is more general, the other two focus on the specific phones. They all at first focus on QPST which is 2G and 3G bands. Two of the three tutorials then also mention QXDM for LTE bands. One of the tutorials , which specifically discusses QXDM/LTE, as an addendum has a FILE you first flash in recovery that lets you make changes needed. This is the guide I followed for the latter steps.

I'm not going to quote the entire guide, but I used that file from Step 1, flashed in recovery. By the end of the process (many steps), QXDM now shows changed values in the LTE config line. You do need both QXDM and QPST to be installed as you use QPST in earlier steps to connect the phone's modem to your PC.

Only when I got the modem to be recognized, was I able to move forward. This same thread has an addendum for Moto phones, which helped tremendously as a few steps differ from the other brand being discussed.

over in QPST was other 2G/3G bands to unlock (if hardware permits) but my Moto Maxx already has all of that I need.

this is what comes with the phone, already enabled (2G/3G). See list the program showed me.

This this is what was all able to unlock, again if hardware (like antenna) permits.

But once I got to this part, then I saw there were no LTE bands in the list. This is for 2G/3G only. Reading the threads more, I saw I had to go to QXDM for LTE band enabling. But still QPST is needed to bond the phone modem to your PC to edit the values. Up in the QPST part, the modem is assigned to COM port 8. I then had QXDM read COM port 8 for values.

Line 6828 is for LTE. Now look down in "fields", where I hit the READ button.

I changed the value, rebooted, when through all the steps (bonding the modem, etc) and read the value again. It kept the edited value.

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COMMENTARY:

Really, all I wanted was to enable band 5 (AT&T) and possibly new band 12 (for T-mobile, for re-sale value in the future).

Any other bands enabled also depends on the antenna(s) in the phone. However, we KNOW this phone (XT1225) had band 5 enabled when it went through the FCC, and Motorola swears it has identical antenna to the Droid Turbo (XT1254).

Since they kept the same FCC ID number it means that when we enable band 5, it will work -- as the hardware (modem and antennas) have remained the same.

Some people have said the new LTE band 12 (for T-mobile) requires a different antenna, and this phone was never FCC tested with LTE band 12 enabled. It's entirely possibly while the band is now "enabled" on my phone, the phone would not receive LTE band 12 due to hardware (antenna) limitations. Same situation with the Europe LTE bands. But LTE band 5 is fine. We KNOW it will work with all the current hardware.

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The Nexus 6 (for North America), however, has all these:

LTE bands: 2/3/4/5/7/12/13/17/25/26/29/41

So, I may just go back and enable those. I don't need Europe LTE bands. Even for those, for "North America" it would depend on stuff like antenna limitations, if Motorola put an antenna in that could use all those. However, we KNOW it will handle LTE band 5, because it passed through the FCC with it enabled. Then, when launched in Puerto Rico (with same FCC number) LTE band 3 was enabled (which is used in many Latin American countries) and not LTE band 5. This phone is being sold in a handful of Latin America countries (Puerto Rico, Mexico, Brazil and Chile). So, AFTER FCC testing, Motorola software disabled LTE band 5 and enabled LTE band 3. All I did was re-enable it. :)

Motorola also made some other post-FCC certification changes. They enabled quad-band GSM. When it went through the FCC, there was only two GSM bands. Again, software changes.

FCC testing (look at the GSM, not the red arrow):

Now being sold: