"Hi, I met with an error 3503 while updating my iPhone to iOS 11. I have never been in such situation and now I’m afraid what to do since I don’t have much technical awareness. Any suggestion for why this iTunes error 3503 occurred and how to fix it? Thanks!"

Full Solutions to Fix iTunes Error 3503

1. Hard Restart Your iPhone or iPad

Our many other articles have also shown you hard resetting is always the first solution you can try to fix any issue. This is really a helpful and common fix which helped many users in solving many cases. This is why again it is on first step. After all, we want our users to fix the issue without any hassle. To execute this process, just begin pressing the “Home” (for iPhone 7 and the later versions, press "Volume Down" button) and “Sleep/Wake” buttons at the same time for nearly 10 seconds. At the time you see the Apple logo appearing, release the buttons. After returning to the home screen, check the issue is gone. Unfortunately, if it still occurs, try the next fix.

Hard restart your iPhone

2. Update iTunes to the Latest Version

This doesn’t take many time to perform, but it usually fixes most iTunes errors. Please remember that whenever you try to update or restore your iPad/iPhone, make sure you have the latest version of iTunes. Using an updated iTunes is always recommended. Therefore, check if you are running older version and update it if yes. Afterwards try updating your device and check if the error occurs or not. All you need to do is to click Help on the left top corner, tap "Check for Updates", and click "Download iTunes". Then you can follow the prompts to continue.

update iTunes

3. Check Network Connection

Another thing you need to make sure about is your network connection. While updating or restoring the device, you need to take care of the internet connection. In other words, you need to check that the internet connection you are working with is stable or not. iTunes error 3503 can be avoided if the connection is active.

4. Turn off "Find My iPad/iPhone" and Try Again

Turning off “Find My iPhone” or “Find My iPad” before updating your device can prove helpful to you. So, if you are stuck with iTunes error 3503, try to turn off the “Find My iPad/iPhone” feature and then attempt updating again. To accomplish this, follow the instructions below:

  • Tap on the “Settings” icon and open it in your iPhone or iPad.
  • In the “Settings” menu, go to “iCloud” option.
  • You will see “Find My iPhone” option. Turn it off by sliding the toggle switch to the other side.
  • A pop-up window will be noticeable now which will ask you to enter the Apple ID and password. Type in and tap on “Turn Off”. That’s about it!

turn off Find My iPhone

5. Fix iTunes Error 3503 with a Third-party Tool

If you are still getting iTunes error 3503, don’t think that you are out of luck because a third-party tool is going to help you there. For this purpose, you need iMyFone iOS System Recovery which is able to fix various iOS issues. You can easily fix the errors you may meet when updating or restoring your device with this tool and get your device back to normal with some easy steps. Moreover, the tool can work with iOS 11 efficiently.

iMyFone iOS System Recovery

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Key Features:

  • It is one of the most secure system recovery tools and comes with no malware.
  • It has three different modes which are named as “Standard Mode”, “Advanced Mode” and “Exit Recovery Mode”. You can fix the errors without data loss using the Standard Mode.
  • Numerous iOS issues including black or white screen, stuck in recovery mode or restarting loops and more can be easily fixed with this program.
  • This tool is very easy to use and no technical knowledge needed.

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How to Remove iTunes Error 3503 with iMyFone iOS System Recovery

Step 1 – Launch the program and click on “Standard Mode” available on the main screen.

interface of iMyFone iOS system recovery

Step 2 – Put your iPhone or iPad in DFU mode or Recovery Mode via following the instructions on the screen.

 enter DFU mode under Standard mode

Step 3 – Here, you are required to download the newest firmware by clicking on “Download” button. The remaining work will be done by the program since it is able to easily detect your device. You will have the suitable firmware downloaded as soon as you click the “Download” button.

You can also download a 10.3.3 firmware and install it on your device using this program since Apple has not banned the authentication for the older version iOS 10.3.3 .

download firmware

Step 4 – Finally, hit on “Start to Fix” option and the fixing process will beging. Within some time, you will be out of iTunes error 3503.

fixing the iTunes error 3503

6. Put Your Device in DFU Mode and Restore with iTunes

This can also help you to fix iTunes error 3503. However, all the data on your device will be deleted in this way. The steps are:

  • Put the device in DFU mode by holding down the “Power” button for 3 seconds. Along with this, start holding the “Home” button as well.
  • Keep doing this for 15 seconds and release the “Power” button and not “Home” button.
  • You will be on the "Connect to iTunes" Screen. Please kindly note the screen of your device should be totally black.
  • Now, connect iPhone/iPad to PC and run iTunes.
  • Choose you iPhone/iPad appearing in iTunes. Go to “Summary” panel and hit “Restore”.
  • The restoring will begin and your device will restart after some time.

restore iPhone with iTunes


iTunes error 3503 is one of the common errors appearing while people use iTunes to update or restore their iOS device. This error happens to many iOS users this time when they are updating their device to iOS 11. We expect that the above tips work for your device and you are now out of the problem. If unfortunately you are still in trouble, please contact Apple store. This is possibly a problem resulted from Apple's end. Just wait for their final solution.