Only yesterday we came across the new #Android 6.0 #Marshmallow boot animation, courtesy of a video taken from the newest developer preview. Thanks to the ever active developer community, you can now get the boot animation on your device as well in the form of a simple to install apk.
All you have to do is copy this file to the root folder and install it. The next time you reboot your device, the new boot animation will be visible. You can also flash the file through custom recovery, which is easier said than done for those new to the concept, so we urge you read up on that before going ahead with the process or simply flash the apk file available below. Be advised that it will replace the current boot animation that you have on your device.
Android 6.0 Marshmallow isn’t expected to release for another two months, so it’s good that users are getting a chance to catch an early glimpse of what’s new with the latest version of Android.
Source: XDA Forums