Top 5 Ways to Fix iTunes Error 3004 During Updating or Restoring iPhone

Way 1: Check the Network Connection

iTunes error 3004 is usually due to iTunes is unable to connect to Apple firmware verification server to verify your device. So the first thing is check the network connection you are using. If the network doesn't work, restarting the network modem or router or use different internet if possible.

Way 2: Switched off Antivirus firewall on Your Computer

Antivirus programs could create connection or software conflict with iTunes. Switched off Antivirus firewall completely or temporarily uninstall your security software.

Way 3: Check your Firewall Settings

A firewall sometimes may mark the iTunes as an insecure or suspicious connection and block all access to the internet. If you are using Windows Defender, disable it a while and update your iPhone. If you use third-party firewall, check whether iTunes is blacklisted or simply disable the firewall for a specific time period.

Way 4: Edit the Hosts File on Your Computer

Sometimes your computer's hosts file is causing communication issue between iTunes and Apple's servers. In this case, you can edit the hosts file on your computer to fix iTunes error 3004.

On Windows 10/8/7:

• Locate C:\\Windows\System32\drivers\etc and open the hosts file with any text editor or Notepad
• Find and delete all the lines that has .apple.com and then Save it.
• Reboot your computer and restore or update your device again.

On Mac OSX:

• Go to \etc\ and find the file that called Hosts and Copy that file and paste it on your desktop.
• Open the file and find the line that has .apple.com and delete all this line that has .apple.com and then save it.
• Locate the \etc folder again and overwrite the hosts file that you just edited.
• Reboot your computer and restore or update your device again.

Way 5: Best Way to Fix iPhone Error 3004 and Upgrade Your iPhone with UltFone iOS System Repair

All methods above can't solve the iPhone error 3004 for you? The best and easiest way to fix iPhone unknown error 3004 is using UltFone iOS System Repair. It offers an one-stop solution to fix iPhone error 3004 or error 3503 and upgrade your iPhone, iPad or iPod and is especially useful when your iOS device get stuck during updating or restoring. Most importantly, you won't lose any of your data using this software.

To get started, free download and install this iOS repair software on your computer.

• Step 1 Run UltFone iOS System Repair Pro after installing, connect your iPhone to computer with USB. On the main interface, click on Start button.

  

• Step 2 Choose Standard Repair to continue. This mode will repair most iOS related issues without data loss. It is worth mentioning that it requires at lease 800MB free space available on your iOS device.

  

• Step 3 Following the wizard to download the firmware package matching for your iPhone. It will take some time since the firmware package is around 2.5 GB.

  

• Step 4 After downloading. Click "Start Standard Repair" to restore your device. After the restore, your device will reboot automatically and update to the latest iOS version.