there is simple solutions...just go to your clock...xplore menu inside clock setting until i found date setting,change it back to the future to 2006..some time the cert xpired..like the car n motor roadtax..once it's xpired u cant go on d road..so change d date setting to 2006 example,then d cert is valid again...after d software installed..changed it back to normal..
hope this help..