Thanks for your help !

Unfortunately, I do not have a copy of the manual but It wouldn't help anyway because it is a bad translation from Chinese to English (word by word I think), I don't understand when I read it !!!
I have downloaded the manual from your site (MP4Nano_Manual_TZ.doc) which is much more clear, speaking real English !!! There are little differences with my own MP4 player but it's ok (mine plays amv videos not mtv one).

If you could find someone to translate it, it would be great. I think I am not speaking English well enough to translate it by myself !

Thanks for your help anyway.