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power button for about 10 seconds to restart the device.

Device does not power on or system crashes

Please charge the battery for half an hour and then hold down the power button for about 8

seconds to shutdown the device or hold down the power button for about 10 seconds to restart

the device.

There is no sound or the other person cannot hear during a call.

Please adjust the volume using the volume button.

The device cannot access the internet via wireless network

Restart the wireless router or go to Settings and restart WLAN.

The device cannot wake up from sleep mode

Please hold down the power button for 8 seconds until the device turns off. Then switch it on

again in normal way.