http://android.clients.google.com/packages/ota/sprint_samsung_l720/8069446ccb676c347a698e64b2df33882547f017.USER_L720_SPT_MK2_CSB_user_RP_to_NAE_CSB_user_RP_Update_FWD.zip
stock update from http://forum.xda-developers.com/showthread.php?t=2646762&page=6