: Android 4.1 introduced "Project Butter" to improve UI smoothness, making it significantly faster than Ice Cream Sandwich. Android Developers
It is recommended to wipe the Dalvik Cache and Cache partitions after flashing to avoid sync issues. Reboot: Select reboot system now . official gapps for android 411 jellybean flashablezip
: Once finished, reboot the system. Google services should appear in your app drawer. : Android 4