iTunes Error 27 on iPhone? 9 Proven Ways to Fix
When restoring or updating an iPhone with iTunes, you may encounter the message: "The iPhone could not be restored. An unknown error occurred (27)." This issue, commonly known as iTunes Error 27, can stop the restore process and leave your device unusable.
Fortunately, Error 27 is usually related to software conflicts, outdated components, or hardware issues, and it can often be resolved with the right troubleshooting steps. In this article, we'll walk you through the possible causes of iTunes Error 27 and share 9 proven methods to fix it.
3 Basic Checks to Fix iTunes Error 27
Before trying advanced troubleshooting methods, start with a few basic checks. In many cases, iTunes Error 27 can be resolved by addressing simple connection or software issues.
Check Third-Party Security Software
Third-party antivirus or security programs may interfere with the connection between iTunes and your iPhone, causing the restore process to fail.
Temporarily disable any security software installed on your computer and then try restoring your iPhone again.
Check the USB Cable and Connection
Make sure your iPhone is securely connected to the computer. If possible, use the original Apple USB cable and connect it directly to a USB port on your computer instead of using a USB hub.
A loose or faulty USB connection is one of the common causes of iTunes Error 27.
Update iTunes to the Latest Version
An outdated version of iTunes may trigger restore errors, including Error 27. Check whether you're using the latest version and install any available updates.
To update iTunes: iTunes > Help > Check for Updates
Once the update is complete, restart your computer and try restoring your iPhone again.
3 Quick Fixes for iTunes Error 27
If the basic checks didn't resolve the issue, try the following troubleshooting methods. These solutions are simple to perform and may help eliminate software or connection-related problems.
Restart iTunes, Your Computer, and iPhone
Before attempting more advanced solutions, restart all devices involved in the restore process. Temporary software bugs or connection issues can sometimes lead to iTunes Error 27.
You can close iTunes and disconnect your iPhone, restart your computer, restart or force restart your iPhone, open iTunes again and reconnect the device and try restoring the iPhone once more. If the restore still fails with Error 27, continue with the next solution.
Use a Different Computer
The issue may be related to your current computer's operating system, USB drivers, or software configuration.
If possible, install the latest version of iTunes on another computer and attempt the restore process again. This can help determine whether the problem is device-related or computer-specific.
Use a Different USB Port or Cable
A faulty USB connection can interrupt communication between iTunes and your iPhone, resulting in restore errors.
Try connecting your device to a different USB port, preferably one directly on the computer. If available, use another Apple-certified USB cable and attempt the restore again.
3 Advanced Solutions for iTunes Error 27
If the previous troubleshooting methods didn't work, the issue may be related to a deeper iOS system problem. In that case, try the advanced solutions below.
Use an iOS System Repair Tool
If iTunes Error 27 is caused by a corrupted iOS system, a dedicated repair tool may help resolve the issue without requiring a full device reset.
TunesKit iOS System Repair can fix a wide range of iOS-related issues, including devices stuck in Recovery Mode, Apple logo loops, update failures, and various iTunes errors. For most cases, including Error 27, the Standard Repair mode can fix the problem without erasing your data. Also, you can use this powerful tool to downgrade iOS 27 to iOS 26, enter or exit recovery mode for free, and download the latest iOS beta version.
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How to fix iTunes Error 27 with TunesKit
Step 1Install TunesKit iOS System Recovery
Download and install the TunesKit iOS System Recovery tool on your PC. Then launch it. Select iOS System Repair on the main interface, and click the Start button.
Step 2Select Standard Repair
Choose Standard Repair to fix common iOS issues while keeping your data intact.
Step 3Download Firmware Package
You need to click the Download button to download the suitable firmware package for your iPhone.
Step 4Start to Repair
After downloading the Firmware Package, simply hit Start Standard Repair to fixing your device. This process will take a few minutes before solving any iOS device issue.
Factory Reset Your iPhone
If iTunes Error 27 continues to appear after trying the previous solutions, you can reset your iPhone to factory settings. This process removes all content, settings, and installed apps, which may help eliminate software-related issues causing the error.
Important
Before proceeding, make sure you have backed up your iPhone using iCloud or iTunes/Finder, as all data on the device will be erased.
To factory reset your iPhone:
- Step 1. Open Settings on your iPhone, and tap General option.
- Step 2. Scroll down and select Transfer or Reset iPhone.
- Step 3. Tap Erase All Content and Settings. Follow the on-screen instructions to confirm the reset.
Once the reset is complete, set up your iPhone again and try restoring or updating it through iTunes to check whether Error 27 has been resolved.
Restore Your iPhone in DFU Mode
If a standard restore fails to fix iTunes Error 27, performing a restore in DFU (Device Firmware Update) mode may help. DFU mode allows your iPhone to communicate with iTunes or Finder without loading iOS, making it one of the most effective methods for resolving serious software issues.
Note
Restoring an iPhone in DFU mode will erase all data and settings on the device. Be sure to create a backup beforehand if possible.
How to Put an iPhone into DFU Mode
The exact steps vary depending on your iPhone model. For most iPhones with Face ID (iPhone 8 and later):
- Step 1. Connect your iPhone to your computer and open iTunes (or Finder on macOS Catalina and later).
- Step 2. Quickly press and release the Volume Up button.
- Step 3. Quickly press and release the Volume Down button.
- Step 4. Press and hold the Side button until the screen turns black.
- Step 5. Once the screen is black, press and hold the Volume Down button while continuing to hold the Side button for 5 seconds.
- Step 6. Release the Side button but keep holding the Volume Down button for another 10 seconds.
If the screen remains black and iTunes or Finder detects an iPhone in DFU/recovery mode, your device has successfully entered DFU mode.
Restore the iPhone
After entering DFU mode:
- Step 1. A message will appear in iTunes or Finder indicating that an iPhone has been detected.
- Step 2. Click the OK option, then click Restore iPhone.
- Step 3. Wait for iTunes or Finder to download and install the latest iOS firmware.
- Step 4. Follow the on-screen instructions to complete the restore process.
After the restore finishes, your iPhone will restart automatically. Check whether iTunes Error 27 has been fixed.
Bottom Line
Although iTunes Error 27 can be frustrating, it is often fixable with the right troubleshooting steps. Start by checking your USB connection, updating iTunes, and restarting your devices. If the error is caused by iOS system corruption, TunesKit iOS System Recovery can help repair it without data loss.
