Itunes iOS 5 update crash Issues

Hi,
Since last week I've been trying to update my iPhone 3GS to iOS 5 and the request is being timed out every time, hence I downloaded it manually from official Apple IOS Firmware for iPhone but in the middle of the download an error occurred & this resulted in my iTunes being stuck and cannot be restored.
Am sure it will update to a new version, but due to the time out the update was stopped, please Is there a way to make it work as a normal phone if so please provide me that solution.
Thank You.
