Hey guys, so after updating my Nokia Lumia 822 to GDR2 (I think this is the latest update available, which added Nokia Lumia Amber update and all) I have had nothing but lag and freezing issues on my phone. For a while I just thought it was a bad update, but I compared my phone to a friends and he has absolutely no issues with the update. I was wondering is there any way to flash or reinstall the GDR2 update with out losing information, texts, and game saves and etc... on the phone? What is the best way to go about this?