Date

I just update gdr2 for my lumia 920. But why date and lock not update after hardreset ?? And my location not accurate ??

Its always best to factory reset after updates.

Factory reset i must install and restore again ???

Have you checked your settings? You can manually input the date and location.


Settings>date+time

Settings>language+region

Not work. Always after hardreset clock and data not sync again.