I want to know how do I fix a 3G signal bar and switch it back to LTE ?

[Michael Robinson8]

I want to know how do I fix a 3G signal bar and switch it back to LTE because It got switch to 3G when I have install XTouchWiz on Xposed do I have to reset my whole phone to get it back to LTE again and my phone model is SM-J327P ?

 

[B. Diddy]

Moved to the J Series forum.

 

[Adebayo Sunday]

Samsung sgh1997

 

[Adebayo Sunday]

How to use my Samsung sgh1997 downloading apps like whatsapp and to install it