Help with my data... It wont connect to 4g or lte... just h+

Ive tried a lot of stuff... I installed the stock firmware lollipop 5.0 with odin... and i just installed the update 5.1.1 and atill have this issue... ive been switching roms.... Flashing modems and bootloaders and nun change... I mean the internet doesnt run that slow but it suposed to be LTE since im in a good lte area... Maybe my s5 have another problem but i want to ask here first to see if anyone can help....Thanks in advance

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