DESCRIPTION

CLEAN FLASH :
Download the latest build and GApps
Reboot to recovery
Make nandroid backup (Not Necessary)
Wipe System, Data, Cache, Dalvik
Flash the latest build and GApps
Reboot

DIRTY FLASH :
Download the latest build
Reboot to recovery
Flash the latest build
Wipe Cache
Reboot

※Please make a backup of your device before installing or updating ROM