As in- settings- Connections- Bluetooth. When you press on the slider does it flick on then off? Is it greyed out? Does it turn on but doesnt find anything? Screenshot of whats showing?
Do you have a pc? Connect the phone to a computer. Turn off device- Press and hold the Volume Up key and the Power key. When the Android logo appears, release keys Use the Volume Down button to highlight Wipe cache partition. Press the Power button to select Wipe cache partition. Use Volume Down to highlight Yes.Press the Power button to confirm the action