Introduction
With these types of players showing their age, it seems that many are starting to suffer from dead batteries causing them to not turn on anymore. Fortunately, these aren't too difficult to open up, with the only hard part being soldering the wires onto the old connector.
What you need
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Use a sewing needle to pry off the controls on the side of the U6, this will open up a small hole that will be used later.
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To reassemble your device, follow these instructions in reverse order.