I have some some problems with a 4G nano clone that look exactly like this one:
The mp4 in question dont whant to play any .amv files. I tried lot of way to do it. I converted my videos with an online thing, I used the 4.0 version of the converter on the website and I used the 3.65 ( I think) one too.
When I try playing the videos when they are into the mp4 I get a blue screen and a message that says: File Error.
Everything in the player work just fine except that. I will send you some camshots later.
Sorry for my bad syntax. English is not my native language.