[HELP] Unlock bands in Boost Mobile

Hello, i bought this phone like 2 weeks ago.

I unlock the bootloader, change the ROM (Stock to OTA), change the Kernel (Believe Kernel) and then try to add the bands. Also i have a nandroid backup of the original stock rom

I try this first:

Quote:

http://forum.xda-developers.com/moto...twork-t3098953

But it doesn't work, also i can only select LTE (4G) option

After read this threads:

Quote:

http://forum.xda-developers.com/cros...ating-t2871269 http://forum.xda-developers.com/gala...ds-to-t2886059

I try to access the modem but i can't, i got stuck on step 6 and can't install the modem driver to modify with the QPST. Can someone help how to do it? The bands of my country are

2G: 850, 1800 MHz
3G: 850, 1800, 2100 MHz
4G(LTE): 1800, 2600 MHz

Thanks for your help! :)