Screen say 309640 minutes?

in this case,u should flash ur phone with latest flash file,then it works correctly.....

Try to hard reset ur phone however this will lead to everything deleting so take out ur sim and memory card and turn ur phone off, hold the power button and when phone vibrates hold the volume button down, this should lead to a triangle with '!' In the middle this means ur doing it right... When it does this, press...

Volume up

Volume down

Press the power button

Then volume down

Ur phone will now restart and everything should be brand new