Remove the non-recognised Chinese characters from file name before loading into product tool,
This is how to get into update mode,
All you do is this,
1) Switch the player OFF using the main on/off switch.
2) Hold down the "MENU" or the "PLAY" button and keep it held down.(try the other buttons if these dont work)
3) Connect the usb to the player.
4) Wait for about 10 seconds before releasing the button.
5) You should be now in "ROCK USB" upgrade mode
6) Then just start Firmware Update and upload your firmware.
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