To Rollback from Android N Developer Preview to Android Marshmallow see this article, We have already spoken about the stunning features of Android N and the changes it brings from Marshmallow but since it’s the main alpha release, there are few bugs as well. The Android N is pretty solid but there are few crashes and additionally some prompts essentially not appearing. So, it’s understandable if you are not wanting to use Android N Developer Preview as your day by day driver. Google lets your rollback to Android 6.0.1 Marshmallow pretty effectively.

How you can roll back to Android 6.0 after having installed Android N Preview:

Step 1:

Go to the Android Beta Program webpage and it will show you the devices that you have enrolled in the program. Click on “Unenroll“.

Step 2:

Then, you should get a prompt asking you to confirm if you really need to leave the Android Beta Program. Click on “Leave Beta” and then, “Ok“.

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Step 3:

You should then get a notification on your Nexus device about a system update, which will take you back to Android 6.0 Marshmallow. If you don’t get the notification, you can manually check in Settings->About phone->System Updates.

Step 4:

Then, you will be presented with all the details regarding the update. Just tap “Download” to start downloading the Marshmallow build.

Note:

The rollback from Android N Preview to Android 6.0 will format all of your data, so ensure to take backup of all your data. Additionally, the update is around 570 MB on the Nexus 5X and it should be similar for other Nexus devices as well, so we’d mention WiFi connection to download the update, if you want to save on your mobile data usage.

Step 5:

Once the update is downloaded, your device will restart and Android 6.0.1 Marshmallow will be installed.

Note:

 If you have flashed Android N Developer Preview manually without registering your device in the Android Beta Program, you will have to again manually flash a compatible Marshmallow build to go back to Android 6.0.1.

After Android 6.0.1 is installed, you will be taken through the different steps of setting up your device like set up WiFi, Google account, payment, fingerprint, app & data backup etc. Once you set up the device, you will see the more stable Android 6.0.1 installed on your Nexus device.