LG E400 User Manual page 193

12. When the screen freezes
If the screen freezes or the phone does not
respond when you try to operate it:
Remove the battery, reinsert it, then turn the
phone on. If it still does not work, please
contact the service centre.
13. Do not connect your phone
when you turn on/off your
PC.
Make sure you disconnect the data cable
between your phone and PC; leaving it
connected might cause errors on your PC.
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