Unhappy [Q] How to get 1700 and 2100 MHz frequencies on SM-N9005

Trying this since a while and finally posting it here.

So Geeks, Is it possible to add 1700 and 2100 frequencies on Samsung Note 3 SM-N9005 international version. If yes, kindly share the trick.

I heard flashing modem helps but also saw on some posts that once flashing is done knox counter is tripped and warranty becomes void.

Thanks,
Dharma.