The boot animation is a series of images stored in a ZIP-file on the system partition in /system/media named bootanimation.zip. The animation can usually be replaced with a bootanimation.zip in /data/local.

The animation usually consists of several parts with one part being a loop to be repeated multiple times until the boot process has been completed, which may lead to perceived endless loops, where a device takes longer than 5 minutes to boot.

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