Access Point Names feature and Tethering Hotspot feature is missing

Hello
I'm from Myanmar (Burma). I bought Sprint LG G3 and I used SIM card from Myanmar. When I bought Sprint LG G3, it came with Android 4.4.2. After I bought, I upgrade to Android 5.0.1 Lolipop. After finish upgrade Lolipop, I can not use Access Point Names feature and Tethering Hotspot feature. And I also can not find these two features under Mobile networks. So I downgrade to Android 4.4.2. But problems is still cause.


I don't know what happen. I want to get back original android 4.4.2 from Sprint Company. Or I want to get these two features from Mobile networks tab.


Please help me