Windows Phone: HTC Windows Phone 8S - Monwindowsphone.com (Blog)

Franc84 “September 8, 2013, 7:02 p.m.

Hi,
Have you tried to leave plugged in more than half an hour before a new test
Otherwise reset such …. :
reset to factory values Using the phone keys

Turn off the phone Press and hold the VOLUME – button.., and briefly press the ON / OFF button Release the VOLUME – button. (!) when you see an icon on .
screen Then press the following hardware buttons in order: VOLUME +> VOLUME -> ON / OFF> VOLUME –
Sincerely, Franc84

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