Cannot see all files

SOURCE: Write protection

Unfortunately the GPX M2104 manual is not available online(due to large size...), so all I can help with is some advice that might seem like the obvious, or some referals- 1. Make sure the HOLD is in off position. Slide the HOLD switch to the opposite side of the word HOLD. Then connect the player back and try to transfer/add/delete the songs you want. 2. If you have a digital form of the manual(please submit it here) search for "write protect" on it(shift+control+f on adobe), or look in the troubleshooting section which is generaly towards the end of the manual. 3. Try resetting the device. If you don't know how, again - it should be on the manual, and if it isn't then unplugging it and disconnecting it from all power sources for a few days sometimes does the trick. you can also try doing it on another PC, or another OS just to make sure it really is the GPX malfunctioning. Good luck

SOURCE: Switch from MTP to USB

I had this same problem and was able to solve it. Just go into Control Panel (make sure it's in Classic View)-> System -> Hardware -> Device Manager, right click the GPX icon under Protable Devices and then click unistall. Then disconnect and reconnect the player. Windows will automatically install the drivers and that's it, you can now go into USB mode again. Hope it helps.

SOURCE: problem playing music files with new Goodmans mp3 player (GMP34G5)

i got mine about an hour ago and it works fine. don't drag and drop music files, sync them to the mp3 player using windows media player.

SOURCE: GPX MP3 player

need to no how to down load songs on this mp3 playeer

SOURCE: deleting music

try making sure that your mp3 player isnt locked... i had the same problem and ijust had to unlock it