If are getting problems like errors and slow downloading while updating your idevice to iOS 5 using iTunes then you have to look for the alternative.
Simple way to update your idevice to iOS 5 is download the firmware directly for the Apple server without the help of your freaking iTunes and then update your device with the help of the iTunes.
Step 1 : Download the required iOS 5 from the following links
Download Links for iOS 5 (Click them to download) :
- iPhone 4 (GSM)
- iPhone 4 (CDMA)
- iPhone 3GS
- iPad 2
- iPad 2 (GSM)
- iPad 2 (CDMA)
- iPad 1
- iPod touch 4G
- iPod touch 3G
Step 2 : Open iTunes > Hold Shift and Click Update > It will prompt you to look for a .ipsw (iPod/iPhone Software) which we have already downloaded, Select it.
If you still get that 3002 error, then its not your fault. The problem lies at Apple server as millions of people trying to update their iDevices. So keep trying the Step 2 until you succeed. Enjoy iOS 5
Note : Don’t forget to disable/turnoff your Anti-virus and Firewall.