What you will need

1. Rooted phone

2. Root Explorer

3. bootanimation.zip

Step1

After installing root explorer, copy the bootanimation.zip file to your SD card.

Step2

Open root explorer and move the bootanimation.zip file to  system / media (do not forget to click “Mount R / W”)

change android boot animation

Step3

Rename/Delete your default boot animation if you have any by going into /data/local folder

change android boot animation

Thats it! Reboot your phone and enjoy your new animation