please write english bro. You can fix 4g LTE without root or without replace rom to stable rom or china rom. You can unlock 4g lte at global stable rom in a way (caranya) : 1.Downgrade to miui global stable 8.1.1.1 2.download 4g lte switcher and phone testing at playstore 3.open 4g lte switcher and this app out on his own (keluar sendiri) and dont worry its normal 4.open phone testing and select sim which will be 4G lte and you select LTE/GSM AUTO PRL. Sebelum buka aplikasi 4g lte harap matikan dulu kartu yg tidak ingin dijadikan 4g.