I am not able to rollback my lumia 1520 Help me

I am update latest build 10536.But my screen scampered continuouslyn i locked my phone and unlocked scampered off sometime,but 5-10 minute its back again.i am try to reset many time but my problem not solved. i also try to rollback my phone but windows phone recovery not installed my pc its show me a hash value error.....if anyone have a solution please please please help me....sorry to my bad english