I had the same problem with my daughter's mp3 player, here is how I was able to fix it:
1. download the firmware software from
here2. unzip & install the software from step 1.
3. remove the battery from your mp3 player
4. start the software
5. hold down the play/pause button while attaching the mp3 player (via usb cable) to your computer
6. once the software's button labeled "start" is activated you can set down the mp3 player (you don't need to hold the play/pause button anymore).
7. check the box to format your data area (this will remove the mp3s, but is needed to get this to work properly again)
8. Click start and follow the on screen instructions
This worked for me... also, make sure your directory names + filenames are not overly long as this seems to be part of what is causing this problem.
I've used both Real Player AND Windows Media Player and I get the same response - the MP3 player seems "frozen" and none of the buttons work now!
I have Archos 404 and recently i plugged it in and my laptop/WMA player doesnt recognize it anymore.... can't even see it in my computer.
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