FileForums - About 512 M Mp3 Player

Hi ,
Im new here, and i need some help on my 512 M mp3 player.
My mp3 S/W: 3.0.42.0003
I have this number written on back of lcd : "MP-482C LCM V13" 04-08-02
And there are some chip have these numbers: Hynix HY27UHDB4G2M, another one has ATJ2085 number. My usb has 7 colors.
The problem is, when i bought it from ebay i tried to upload some songs to it and said that its full, but i didnt upload any songs yet to it, and when i formated it using FAT this issue was resolved, but i get another problem later which was after uploading songs to mp3 player its says: Invalid format.
Then i tried to upgrade frameware, but when i upgrade it, it lost its 7 color and become one color. If some body can help me to get the original FW and solve my problem i will be gratefull.
Sorry for my english.
Thanks.