Steps To Upgrade Asus Zenfone 5 to Lollipop

there are a number of steps that you should do before update to android L: please download these firmware versions and update it in order: V1.18.40.10> V2.19.40.18> 2.22.40.54>3.23.40.60 (Android L) i would suggest you update it manually, below link shows you how to update firmware on your phone http://www.asus.com/zentalk/forum.php?mod=viewthread&tid=1158 link below shows you where you can find these firmware files: http://www.asus.com/Phone/ZenFone_5_A501CG/HelpDesk_Download/