asus zenfone 5 error

Instructions for Hard Reset ASUS ZENFONE 5 (Part 2)
when asus zenfone 5 fails or has problems, you do not need to use your computer or download any programs or applications to your computer. instead, you can reinstall or restore the default settings above. android operating system has been deleted by hard reset or master format.
Fix some basic errors on ASUS ZENFONE 5 (End part)
to extend the battery life of asus zenfone 5, you should turn off some unnecessary features like gps, 3g, wifi, reduce screen brightness ... when not in use.