AGPtek A21 Mode D'emploi page 11

 Format device / Factory settings. Format the
device or restore to factory settings. Note: Before
formatting the device, please backup the file so as
not to lose any files.
Trouble Shooting
 Can't turn on the player
- Please check whether the player is run out of power,
connect the player to an adapter and reboot after
charging.
 Can't charge the battery
- Disconnect the player, and then reconnect it.
- Charge the battery under an proper temperature
within the range of 5℃(41℉) to 35℃ (95 ℉).
- Turn on the computer.
 Can't download files from computer
- Please confirm whether it's connected properly;
- Please check whether the storage space of the
internal memory is full;
- Please check whether the USB cable is damaged.
 Can't recognize the player when connected to
the computer via USB cable.
- Disconnect the player, wait for a few minutes, and
then reconnect it.
- Disconnect the player, restart the computer, and
then reconnect the player.
- Connect your player to another USB port on your
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