Having iTunes Error 4003? Here's How to Fix It?

Each iOS update brings to the table a wide range of updates and new, powerful features. So it’s only right to update your Apple device and iTunes to the latest iOS release if possible in order to experience better performance across the spectrum. Sometimes however these updates to iTunes may result in a few errors as well, most commonly iTunes error 4003. In this article, we will discuss what exactly is error 4003 iTunes, what causes it and several ways to get it resolved without any data loss.

Part 1: What is iTunes Error 4003?

iTunes Error 4003 generally occurs when you try to backup or restore your device with iTunes. Furthermore, error 4003 iTunes can also be caused by a corrupted USB cable, doc or hub or simple if your iPhone gets disconnected when connected with iTunes. Before exploring any of the following solutions to the error 4003 iTunes issue you’re experiencing, it is best to first check the hardware you are using including.

  • • The USB (lightning) cable.
  • • Try a different port on your PC.
  • • Remove or add a USB hub between your device and computer.
  • • Try and connect your PC or laptop directly with the internet source and forgo any hubs, routers or switches

If the aforementioned, initial error 4003 iTunes solutions do not bring success, then give the following advanced iTunes error 4003 a shot.

Part 2: Fix iTunes Error 4003 without Data Loss

When fixing any error be it iTunes error 4003 or 4005, there are always chances of data loss, so your best bet is to use a iPhone 7 error 4003 solution that ensures that your issue is fixed, and your data is safe and secure. And the only software that comes to mind that is bound to get the job done right is none other than dr.fone - Repair. Backed by a wealth of experience (10 years+), dr.fone is billed as the world’s first iOS and Android data recovery software that does a whole lot more than just fix iTunes error 4003.

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  • Fixes other iPhone error and iTunes errors, such as iTunes error 4013, iPhone error 14, iTunes error 27, iTunes error 9 and more.
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Here are the steps to fix iTunes error 4003 with dr.fone - Repair.

1. Download dr.fone and install it on your PC. Launch dr.fone and choose Repair from the control panel.

fix itunes error 4003 with dr.fone

2. Now it’s time to connect your iOS device and allow dr.fone to detect it. Click Start once it does.

start to fix iphone error 4003

3. The dashboard will now be populated with your device information such as device model and system version. Click next to confirm the details.

4. You will now have to trigger DFU (Device Firmware Update) mode on your device. Here’s how to go about it.

For iPhone 7, iPhone 8 or iPhone X

  • 1. Turn your device off.
  • 2. Hold down the power and volume down button together for approximately 10 seconds.
  • 3. Now release the power button but keep the volume down button pressed until DFU mode is triggered.

boot iphone 7 in dfu mode

To trigger DFU mode on other models of iPhone:

  • 1. Turn the device off.
  • 2. This time press and hold down the power and home button together.
  • 3. Now let go of the power button, but still keep the home button pressed until your device enters DFU mode.

boot other iphone in dfu mode

5. You will now be prompted to select the right firmware for your device.

confirm iphone firmware

7. The firmware file can be pretty large, so may take a few moments to download.

download iphone firmware

8. To fix error 4003, click on the Fix Now tab.

click fix now to fix iphone error 4003

9. Your connected cell phone should now boot up into normal mode after successful completion of the repair process.

iphone error 4003 fix complete

You can now disconnect your iPhone and launch iTunes and you should not have an error 4003 anymore.

Part 3: Basic Solutions to fix iTunes Error 4003

Solution 1. Update iTunes to Fix Error 4003

You should always have upgrade to the latest version of iTunes, and not having done so may cause iTunes error 4003. To update iTunes, launch the software, then click help from the menu and select Check for Updates. 

update itunes to fix iphone error 4003

Solution 2. Close Third Party Software

Third party software such as antivirus programs may interfere with certain process of iTunes and result in error 4003. So close any programs you may have including web browsers, open iTunes and check if the issue still exists.

Solution 3. Restart AMDS to Fix Error 4003 (Apple Mobile Device Service)

To restart AMDS, you first have to close iTunes and any devices connected to your PC.

restart apple mobile device service

  • 1. Next, press the Windows key and letter “R” together and then enter the command “services.msc”.
  • 2. From the service list window that opens, select “Apple Mobile Device Service”.
  • 3. Right click on it and from the menu that appears, hover to all tasks, and lastly click restart.

Solution 4. Configure Windows Firewall to Fix iTunes Error 4003

  • 1. Press and hold the Windows button and letter “R” together.
  • 2. Type “firewall.cpl” in the field.
  • 3. Once the Windows firewall screen opens, check to ensure everything is highlighted in green. If there is any red highlighting, proceed to the next step.
  • 4. From the menu on the left hand side, select Click “Allow a program or feature through Windows Firewall.” OR “Allow an app or feature through Windows Firewall.”
  • 5. Click on change settings and ensure iTunes is selected under both public nd private network categories.

allow itunes from windows firmware

6. From the same list, make sure that Bonjour is selected only for private networks.

allow bonjour service

Note that if the above mentioned options are missing, you can activate them by clicking on the Allow Another App button.

Solution 5. Run iTunes as Administrator to Fix iTunes Error 4003

If you haven’t already, try starting iTunes with administrator privileges. To do this, right click on the program, and select Run as Administrator.

iTunes error 4003 is not common as other Apple software errors and generally occurs when you're trying to sync your device or restore iTunes. If you want to fix iTunes with absolutely no data loss, Dr Fone Repair is a wise choice. But we've also provided you with myriad other solutions you an try to fix iTunes error 4003. 

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dr.fone - Repair (iOS)

dr.fone - Repair (iOS)

Fix various iOS system issues like iPhone black screen, White Apple logo, etc. without any data loss.

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dr.fone - Recover (iOS)

World's 1st iOS data recovery software to recover data from iPhone, iTunes/iCloud backups.

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