Main article is here http://goo.gl/Jf1qgd Features of Android 6 App Standby No more battery drain from seldom used apps: App Standby limits their impact on battery life so your charge lasts longer. 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! 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. Videos Over View of android 6 https://www.android.com/static/videos/android-m-now-on-tap-motion.mp4 https://www.android.com/static/videos/android-m-battery-motion.mp4 Resurrection Remix ROM (without google apps) http://downloadandroidrom.com/file/.../ResurrectionRemix-M-v5.6.0-20151214-hlte.zip Google Apps (Gapps) http://highonandroid.com/download-android-6-0-marshmallow-gapps/ Run the files from your recovery menu.... you might need to place the file (Custom ROM & GAPPS) on SD card for you to install it. If You Don't have startup recovery menu Don't have recovery download it and install it via Odin (Odin Attached) Go to https://twrp.me/Devices/ find your device or search for it .... download the tar file T-mobile direct link --> https://twrp.me/devices/samsunggalaxynote3tmobile.html After, Press and hold Power+Volume down+Home to go to download mode Use Odin to install twrp recovery. ... after it is done go to recovery, Press and hold Power+Volume up+Home If boot-loop got stock in the boot up screen try removing the battery (yes and usb cable) and reinserting it and restart the phone. I Don't like Android 6 and want to go back to stock rom no problem. Download the stock ROM form here http://galaxynote3root.com/galaxy-note-3-stock-firmware/ you might need to use a download manager ( like the open source Free Download Manager) the size of the Stock Rom is way way way bigger than custom ROM. After you're done downloading the zip file .. Extract it ... place your phone in download mode ... run Odin .. flash it and return your phone to normal.