[HOW-TO] - Fix “This device isn’t eligible for the requested build” Error in iTunes When Updating iOS 6.1

Advanced: Manually Editing Hosts

• Quit out of iTunes
• Go to the hosts file. For Mac OS X this is located at: /etc/hosts or /private/etc/hosts and in Windows it is located at: c:\windows\system32\drivers\etc\hosts
• Open the hosts file with Administrative privileges so that changes can be made and saved (eg: sudo nano /etc/hosts)
• Look for a line that resembles something like this:
74.208.10.249 gs.apple.com
• Put a # in front of that to comment it out, making it now look like this:
# 74.208.10.249 gs.apple.com
• Save the hosts file

NOTE (Updated: Feb. 8, 2013): This was originally posted for iOS 5.1.1 but it can also apply to any iOS including the latest release iOS 6.1.

POPULAR TIPS:

• [Tips & Tricks] - 40 iOS 6 Tips
• [How-To] - Recalibrate iPhone HOME Button to make it More Responsive
• [How-To] - Set APN for iPhone 4
• [How-To] - Fix “This device isn’t eligible for the requested build” Error in iTunes When Updating iOS 5.1.1
• [HOW-TO] - Removing Video Source from XBMC List (Apple TV 2)
• [How-To] - Change permission via iFile