X-Micro Tech. 220 - Manual (Page 25)

To enable all keys on the player, push the key ( ) to the reverse
direction of (= ‘OFF’ position).
Once the HOLD function is enabled, all keys on the player become
ineffectual. Any key is pressed, below picture will prompt:
Even HOLD function is turned on, you also can execute file
transferring/deleting on the player when connecting to the computer.
RESET Function
This player provides a Reset Button on the back side of device. Please note
that you only need to use this button if the device does not response for
several minutes.
The button is like a power down button of the device. You can turn off the
device by using a reset tip, such as a straightened paper clip.
This is an advanced operation. Normal users are not recommended to
perform it.
Once you press Reset button, the adjustments you make during last
operation will be gone.
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