Security Settings Problem

[microshahin]

Hello,
I've bought a Samsung Galaxy S2. It has a operating system of Gingerbread 2.3.3 I've upgraded it from 2.3.3 Gingerbread to 4.1.2 Jelly Bean. But after upgrading my any phone security is not working. Furthermore after upgrading my IMEI no has been changed automatically. Also camera auto resolution is not working. When I press my power button the phone goes directly off that means I've no power menu option.

Can anybody pls give me any solution ????
Pls pls pls coz I am suffering a lot with all of these problems ! !

 

[Slug]

Try a factory reset of the handset.

Samsung's practice is to perform 'in-place' updates which preserve user data, but in reality a reset is the best policy for jumping two major OS versions to ensure no leftovers remain of the earlier version.