All you need to do is either go to the settings on the mp4 player(if there is a screen) and hit reset. Or you could plug it into the computer with a USB cord and right click on the name of the mp4 player when the computer accepts it as a device and then you click on format.
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It's easy to put mp4 in a mp4 player. You only copy the mp4 file on your PC and paste it in your mp4 player. But before coping you should transfer some videos to mp4 format.