Samsung GT-B7620 User Manual(Extended Usage Guide) User Manual page 23

Reset the device
If your device freezes or hangs, you may need to
close programs or reset the device to regain
functionality. If your device is still responsive but a
program is frozen, close the program via Task
Switcher. p. 27
If your device is frozen and unresponsive, slide open
the device and use a small object, such as a
toothpick, to press the reset button.
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