How to enable gsm/lte/wcdma option in stock rooted SPRINT G4

Hi ,
I am on stock rooted , gsm unlocked zv6<br />
All is well but I wish to activate the gsm lte option , can you guys kindly guide me how can I do that .<br />
I am using my g4 outside of the US<br />
<br />
Thanks in advance <br />
<br />
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