If
HTC Desire 520 is running slower than normal, is unresponsive, or has an app that is not performing properly, try rebooting and see if that helps solve the problem.
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If the display is off, press the POWER button to turn it back on.
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Press and hold the POWER button, and then tap
Restart.
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When asked to confirm, tap
Restart.
Note: If these steps don't work, you can remove and reinstall the battery, and then turn
HTC Desire 520 on to restart it.