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you should reinstall the firmware in the mp3 player
to do that you can go on the mp3 manufacture's website click on support and look for the appropriate firmware that fit your model number
once it's download
plug your mp3 to your pc and then run the firmware updater
you should be able to use your mp3
The GPX ML638B takes only AMV files for video. you have to use the utilities tool that comes with it to convert video files. or find one online if you prefer. also you can download pre exsisting AMV format movies to load into it. just be sure its in a USB mode and load directly onto the 1st area when you open its designated drive location. as for Mp3's no conversion is needed. simply load em onto the device. remember. video and pictures requre it to be set in USB mode (mode button on its side) and music out of USB mode. while plugged into the PC on its screen will show USb on lower left of screen when its in usb mode. and wont show if its out of it.
I contacted GPX. It's really easy.
With the left side button in the "off" position, press the "play/pause" button in the center of the circle for 3 seconds. It will then turn on. To turn off, do the same thing, and it will display "BYE" on the screen before powering off.
This was NOT in the instruction manual and they admit this was a mistake on their part.
There is a reset button on the back use a paper clip to rest press and hold for a second or two then let go - also make sure the power slide/button is in the off position for the mp3 player to work right