Update to iOS8 official from iOS8 beta

Hi,

I've been using iOS8 beta 5 on my iPhone 5 16G model, trying to install the official build version. Having some problems and some questions here!!

1. My iPhone picks up the OTA update, but my iTunes says i am up to date
2. Freed up 5.8G by deleting large portion of my pictures and many many apps but still the OTA says low storage problem??

Do i need more free storage to install ??
Any other way to use iTunes to upgrade to OA version?

 

All solved

Problem all solved, seems i just needed some more space!