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In my opinion,there are two points you should pay attention to for the moment:
1.the wrong capacity had been sent to you.You can take some photos of the memory info (Scroll to Setup/Setting  memory...

Sadly news!The same problem as my player bought last month.
The best way to solve this problem is to upgrade it's firmwar.

However,you should first know which firmware compatible with your...

Firstly,you should make sure that which kind of format does your mp4 player supported,like:format MP3, WMA, WAV, ASF, ACT.If you are not so sure about it's format,please refer to the manual of your...