Download Hidden Settings apk then try to find Radio Bandmode or (MiuiBandMode) Then lock mo konting explore lang about sa app . Kapag nag secret code dial kasi ayaw gumana ng engineering kaya recommend ko sayo yan . Not sure if 100% working pero try mo na din . Sa area ko kasi LTE band 3 malakas nag try na din ako ng Speedtest hindi sya kalakasan pero green ping naman sa ML at COD goodluck sayo Ts.