iTunes error 3014 occurs because iTunes is unable to connect to Apple's server http://gs.apple.com/ in order to download all necessary data to update your iPhone
How to Edit HOSTS File on Windows:
Step 1: Launch Notepad or any text editing tool. Now, launch windows explorer or press Windows + E, navigate to C:\Windows\System32\drivers\etc and then in ETC directory open HOSTS file with Notepad.
Step 2: Then just simply remove 74.208.10.249 gs.apple.com from your HOSTS file and then save it.
How to Edit HOSTS File on Mac:
Step 1: Click on Go -> Go to Folder and then enter path /etc
Step 2: Open HOSTS file via TextEdit or any text editing tools and then delete 74.208.10.249 gs.apple.com.
How to Edit HOSTS File on Windows:
Step 1: Launch Notepad or any text editing tool. Now, launch windows explorer or press Windows + E, navigate to C:\Windows\System32\drivers\etc and then in ETC directory open HOSTS file with Notepad.
Step 2: Then just simply remove 74.208.10.249 gs.apple.com from your HOSTS file and then save it.
How to Edit HOSTS File on Mac:
Step 1: Click on Go -> Go to Folder and then enter path /etc
Step 2: Open HOSTS file via TextEdit or any text editing tools and then delete 74.208.10.249 gs.apple.com.