How To Install Android 6.0 Marshmallow On Nexus 5

Android M was released at Google I/O 2015 and the developer preview is available to download for Nexus 5, 6, 9 and Nexus player. By installing the android M developer preview 3 [android 6.0 Marshmallow] on your nexus device you will be able to test your android apps on android M. You can see how they perform and what errors, if any they return. This is the final release

Warning : Flashing the android M developer preview 3 will erase entire data stored on your nexus device. So before doing anything backup your data.

Downloads

Nexus 5 (GSM/LTE) hammerhead : hammerhead-MPA44I-preview-2ebbc049.tgz

How To Install Android 6.0 Marshmallow [Android M Developer Preview 3] On Nexus 5

• Download and install android SDK. This also includes Google USB drivers.
• Download the android Marshmallow system image for Nexus 5 from above and unpack it in android sdk>platform-tools folder.
• Enable USB debugging on your Nexus device by going to ‘Settings>Development>Debugging’.
• Power of your phone. Connect the nexus device to PC.
• Enter into bootloader mode by pressing and holding ‘volume up’, volume down and power button. Alternatively connect the phone to PC and open a command window in platform-tools folder and run the command ‘adb reboot bootloader’.
• Execute the command ‘fastboot oem unlock’. A prompt will appear on your phone to confirm. It will wipe entire data.
• Now execute ‘flash-all.bat’ command. If you are using a MAC then type ‘flash-all.sh’. This will install the latest android M developer preview 3 on your Nexus 5.
• After flashing you can again lock the bootloader by typing the following command and executing 'fastboot oem lock'.
• Now go on testing the new android 6.0 Marshmallow.

Note : If anytime you want to go back to your original android firmware then download the nexus image from Google Developers and flash it by using the above procedure.