Hi I recently bought a 4GB mp4 player from ebay and at first it was working pefectly but after a few minutes of fiddling with it it stopped playing videos and gave me a "format error!" whenever I tried to play a video or image. I believe it has something to do with the a damaged firmware but I`m not sure. The videos I put in it are all amv format.
The current firmware version it has is
Device name: LISONG MP3 Player
Productor: Wilson Co. Ltd.
Version: 9.0.48
Front view of player:

Back view:

Main menu view:

The error that is troubling me
Please help!