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how to update lollipop and kitkat to android marshmallow'
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MARSHMALLOW

A battery that works smarter, not harder
Android Marshmallow saves your juice for what matters most
Doze
When your device is at rest, Doze automatically puts it into a sleep state. So your phone can still set off your alarm in the morning even if you forgot to charge it. Phew!
App Standby
No more battery drain from seldom used apps: App Standby limits their impact on battery life so your charge lasts longer.
Greater control for more peace of mind
Permissions your way
No need to give apps access all the time. Android Marshmallow lets you define what you want to share and when. Turn permissions off at any time, too.
Simplified security with your fingerprint
Skip the crazy passwords: The key is at hand. Your fingerprint unlocks your phone and lets you securely breeze through sign in and checkout on Android Pay, the Play Store and even in apps.
All about Android 6.0,
Marshmallow