hello guys..i'm new here..i'v been using my nexus 4 for 7 month now..my N4 never let me down until now..after the last jelly bean update my navigation stop responding in portrait n landscape..i'v try factory restore but the problem is still there..is there any one here know what is my problem..

Yup the last one 4.3..don't know why my navigation bar not responding at all..can't use the back, apps and task button..there for I can't used my phone..