You may like to read some of earlier posts for any help required with update,
[Just updated to Windows Phone 8.1 (Lumia Cyan)? Here is your guide to Niravana!!]
For catching everything about Lumia Cyan and Windows Phone 8.1 which includes:- Full Changelog, Hands-on demo videos, Tips, Tutorial no better place than our dedicated Lumia Cyan and Windows Phone 8.1 page.