[Q] samsung i9082 lock screen problem topic

hello sir i m from pakistan i am using samsung galaxy grand i9082 with official 4.1.2 rom. one week ago i flashed it to 4.2.2 official rom all is well but power button menu and lock screen not work.then i downgrade it to 4.1.2 but not working so plz help me i am much worried about it :(