Angry [Q] N9005 and how to make LTE working

Dear All,

I have bought a Note 3 in USA with serial number as follows: N9005GSMH and FCC:A3LSMN9005.
I have a problem because I don't know how to make LTE working. I'm using this smartphone in Poland, in settings I can't see option which allows to switch to LTE band. I have good LTE network coverage in my city but I haven't possibility to switch radio to LTE.
This is new phone so it is not rooted, two weeks ago new official update was made from JB to KK.

Can anybody advice how make LTE option visible in network settings?

I have found somewhere on this forum that after making some changes in configuration file in system directory LTE option appear in settings. But maybe it can be done without rooting?

Best Regards
Wojciech