Try formatting and installing the stock ROM for 3 or 4 times without turning the phone on.
Sent from my Samsung Z2 with ACL using XDA free mobile app
I would like to help but have you solve it yet.
Sent from my Y220-U00 using XDA Free mobile app
With lollipop you must root it seamlessly. That is you have to boot to recovery and install super-user zip. Another method is installing kingo supersu and then go to apps permissions, you will see additional permissions, click it and you will see ...