Slow Transfer Speed/not playing songs under folders-Mp4

[al3xis]

Hello,
I have recently order a mp4 player,from chinavasion.
This is the mp4 -> http://www.chinavasion.com/product_i...aad25fc62e6f0/
But i have 2 problems.
1)Slow usb transfer speed(my other gadgets with usb its ok)
2)If i create folders in the main audio folder,undet them songs doesnt appear

Have anyone this mp4?Any solve?

Thank you a lot!