android back button not working after upgrading to 4.1.1

android back button not working after upgrading to 4.1.1

References

Reference NO 1

http://stackoverflow.com/questions/13649886/android-back-button-not-working-after-upgrading-to-4-1-1

Reference NO 2

http://www.droid-life.com/2013/05/13/samsung-galaxy-s3-updated-to-android-4-1-2-on-t-mobile-adds-multi-window-functionality/

Reference NO 3

https://support.t-mobile.com/thread/40260?start=0&tstart=0

Reference NO 4

http://forums.androidcentral.com/samsung-galaxy-note-2/250444-wifi-not-working-after-4-1-2-update.html

Reference NO 5

http://www.phonearena.com/news/Problems-with-Android-4.1.2-update-to-Motorola-DROID-RAZR-and-Motorola-DROID-RAZR-MAXX_id41128

Reference NO 6

http://www.android.gs/droid-razr-maxx-update-android-4-1-2-jelly-bean/

Reference NO 7

http://android.stackexchange.com/questions/45882/can-i-get-my-old-keyboard-back-after-update

Reference NO 8

http://www.androidpolice.com/2012/08/28/getting-to-know-android-4-1-part-5-calendar-and-settings/