read these
http://forum.xda-developers.com/galaxy-s5/general/guide-enable-unlock-edit-add-gsm-lte-t2948822
http://forum.xda-developers.com/galaxy-s5/general/how-to-add-rf-lte-frequency-bands-to-t2886059
these 2 links shows the ways to enable lte bands , just by enabling bands on dfs will not help ...even don't try on each and every phone it sometime can cause issues to phones such as
imei , baseband will show unknown,sound will stop working (mic , speaker none works) , phone not responding to hidden codes , not connecting in diag mode etc.
i and few others have faced the issue even flashing rom won't help ...be careful with experiments