MyMPx.org - Copy of Ipod Nano 5Th 8 Gb... help me to solve the problem

Hi, I'm new
I searched in the forum a solution but I could not :(

I bought on ebay an mp3 like this:
5th 8GB 2.2'' Lcd MP4 MP3 Player Video FM Radio +Camera su eBay.it, iPod MP3 Players, Electronics

These are the information that I managed to get:
1) Media player
Firmware: 090708_V.04
2) Samsung 004
K9GAG08U0M
PCB0
YCLD56AAC
3) AT J2237T
ZAB1UAC 11R
4) ADevice SD81F641642C-7F
ECO733
5) Result with H2testw:
Warning: Only 7763 of 7765 MByte tested.
The media is likely to be defective.
1.8 GByte OK (3808832 sectors)
5.7 GByte DATA LOST (12089792 sectors)
Details:5.5 GByte overwritten (11711988 sectors)
0 KByte slightly changed (< 8 bit/sector, 0 sectors)
184.4 MByte corrupted (377804 sectors)
32 KByte aliased memory (64 sectors)
First error at offset: 0x00000000743c8000
Expected: 0x00000000743c8000
Found: 0x00000000743c0000
H2testw version 1.3
Writing speed: 7.03 MByte/s
Reading speed: 7.95 MByte/s
H2testw v1.4

This player does not work correctly when loading files some of them are loaded with errors, and some folders are subfolders with the same title of mainly, but impossible to open and / or remove.

Can you help me?
I would like to format it with a new firmware, you can tell me what should I do? What programs use?

Tanks in advance