Follow These Steps:-

NOTE:- Root Is Required For This Process. If Your Phone Is Not Rooted , Root It First.

1. First of all you need download Marshmallow Boot Animation file in your android device.
2. Now download and install the cool file explorer that is ES File Explorer From Playstore in your android device, this is one of the best explorer where you can explore system files too.
3. Now locate the zip file of boot animation that you have downloaded in your ES file explorer.
4. Now long tap on the zip file and copy it.
5. Now tap on the directory path and select device and you will head towards the root folder of your device.
6. There go to folder System -> Media and there rename the stock bootanimation.zip file by adding .bak.
7. After that bootanimation.zip will become bootanimation.zip.bak this is to backup your current boot animation.
8. Now paste there your Marshmallow boot animation zip file that you had copied.
9. Now reboot your android device after this.
10.Thats it you are done, now you have successfully installed latest android boot screen on your android.

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