How to install Android 6.0 Marshmallow on your Nexus smartphone..2015

The Android M developer preview was released at Google I/O 2015 in May, and has just seen the last of three planned updates prior to its final release. It's also been announced that Android M stands for Android Marshmallow. In this tutorial, we'll show you how to install the Android M Developer Preview 3 on your Nexus 5, Nexus 6, Nexus 9 or Nexus Player. 

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Note: The Android M developer preview has only been released for the Nexus 5, Nexus 6, Nexus 9 and Nexus Player, so do not try to flash the firmware on any device other than these, or you will be in for a world of pain. Or at least, you won't get very far. In any case, this process will wipe your device, so make sure you have a backup before you proceed.

How to get the Android M developer preview 3

Flashing Android M couldn't be simpler. The final Android M preview, which has a build number of MPA44G, works just like any other Nexus factory image – you simply download the file and flash it.

Prerequisites

• Download ADB Tools and unpack the zip file
• Download Android M preview for your Nexus (and unpack it in the ADB Tools folder):
• Nexus 5 | Nexus 6 | Nexus 9 | Nexus Player
• An unlocked bootloader
• USB Debugging enabled
• The relevant drivers installed on your computer

Install Android M on your Nexus now

1. Turn your Nexus off.

2. Press and hold Power and Volume Down to restart your Nexus to the bootloader (see image below).

3. Connect your Nexus to your computer with a USB cable.

4. Open a Windows Explorer window and find the unpacked firmware you downloaded to the ADB Tools folder.

5. Double click the flash-all.bat file and let it do its thing.

6. Your Nexus will reboot and be running the Android M preview, version 3. If it doesn't, check the troubleshooting section below.

Troubleshooting

If you have a problem before installation, make sure you have USB Debugging enabled and an unlocked bootloader, as described in the linked guide above.

Bootloop

If you get stuck in a bootloop (your Nexus sticks on the loading screen at startup), you can try to clear the cache partition first by going back to the bootloader and using the volume keys to enter Recovery Mode (use the Power button to confirm your selection). Once you've wiped the cache partition you can try to reboot.

If you still don't get past the boot screen, go back to Recovery and select Wipe data/Factory reset and press the Power button to confirm. This should clear things right up.

ADB problems

If you get an error message in the command prompt window telling you you're missing the system.img file, do the following: unpack the image.zip file as well and copy and paste those files into the same place as the rest of the unpacked files (this should be the ADB Tools folder alongside the as adb.exe and fastboot.exe). 

Then, open a command window (hold Shift and right click, select 'Open command window here') and enter the following commands:

• fastboot flash bootloader .img
• fastboot reboot-bootloader
• fastboot flash recovery recovery.img
• fastboot flash boot boot.img
• fastboot flash system system.img
• fastboot flash cache cache.img
• fastboot flash vendor vendor.img

Once your Nexus reboots it should be running the Android M preview. You won't have full functionality, but you'll get a good look at what everyone else will be getting in a few months time.

Have you installed the Android M preview yet? What do you like so far?