Hey Friends, As You Know The S40 Users Are Facing Problem At Installation Signed Apps "Certificate not valid according to devices date" Beacuse After 2nd January Nokia Online CA Certificate Has Expired And Most Apps Are Signed With This Certificate And All S40 Have Nokia Online CA Certificate & Can't Be Deleted So I'm Going To Tell You Solution Of This Problem...
So First Go To Setting > Date&Time And Make Date To 2015 2014 2013 Then Install Your Signed App And Re-Change Date Again... And Enjoy.....
