mobile

So here is what I want to do: buy a new Unlocked Note 4 from WIND mobile (canada), to use it for T-Mobile (when I move back to the US later this year).
Here is the problem: The WIND note 4 comes with the LTE disabled. So if I were to bring it back to the US and use my Tmobile sim card, LTE still wouldnt work, correct?

Is there anyway to flash an original T-mobile rom on the unlocked WIND mobile and convert it to a Tmobile device with LTE activated?

Any help would be appreciated! Thanks in advance.