To fix an iPhone or iPad that cannot be synced. Unknown error -39 has occurred

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Many iTunes users are faced with one of the most common problems in iTunes – error 39 saying Can’t sync iPhone (iPad/iPod). An unknown error has occurred (-39).

How does this unknown error arise? The iTunes 39 error usually occurs when synchronizing or restoring the iPhone iPad iPod with iTunes. Many Apple users experience iTunes Error 39, especially when trying to delete photos or videos from their iOS devices or download photos or videos from their iTunes library to their iOS devices.

Worse, once iTunes error 39 occurs, you will not be able to update iOS data like photos and videos in iTunes or restore your iOS device from iTunes, which is definitely frustrating and annoying. This guide presents several solutions to correct an unknown error.

What is the reason the iPhone or iPad cannot be synchronized. An unknown error has occurred (-39)

The unknown error (-39) refers to error 39 in iTunes and usually occurs when syncing an iOS device with a Mac or Windows computer. This usually happens when you delete photos from your iPhone or iPad, or when you download photos and videos from your iTunes library.

If this error message 39 appears in iTunes, you may not be able to back up photos and videos from your iPhone or iPad that have been updated or restored in iTunes. In other words: This error code is a data loss warning.

In this article, you will learn how to fix iTunes 39 errors easily with different troubleshooting methods, including the easiest and fastest method.

To fix the synchronization error of iPhone or iPad. Unknown error -39 occurred

April 2021 Update:

We now recommend that you use this tool to fix the error. The tool also repairs common computer errors, protects against file loss, malware and hardware failures, and optimizes your PC for optimal performance. With this software, you can quickly fix your PC’s problems and prevent others from getting them too:

  • Step 1: Download the PC repair and optimization utility (Windows 10, 8, 7, XP, Vista – Microsoft Gold Certified).
  • Step Two: Click on the Start scan button to detect problems in the Windows registry that may be causing PC problems.
  • Step Three: Click the Fix All button to fix all issues.

Updates window

  1. Press Windows + I to open the settings.
  2. Click the Refresh and Security button and select Refresh Window from the left pane.
  3. Select the Check for Updates button and wait for the checking process to complete.
  4. Click Download and Install to have Windows prompt you to install these updates.
  5. Wait for the updates to be installed and try backing up your device.
  6. Let’s see if the problem persists.

Disable anti-virus software

  1. Press Windows + I to open the settings.
  2. Click on the Update & Security option and select Windows Security on the left tab.
  3. Select the Virus and Threat Protection option, and then click Manage Settings under Virus and Threat Protection Settings.
  4. Virus and threat protection tab.
  5. Click on the toggle switch under the Live Protection heading to turn it off.
  6. Select Yes to all questions to prevent a virus from occurring during the backup process.
  7. After that, try making a backup and see if the problem persists.

Update iTunes

  1. Start iTunes and click the Help option at the top.
  2. Select Check for updates from the list.
  3. Wait until the check is complete and all available updates are displayed for you.
  4. Download and install these updates on your computer.
  5. Restart the computer and see if the problem persists.

Clear photo cache

Mac:

  1. From the Finder menu, press Go and choose Home.
  2. Tap the Photos option and choose the Photo library, iPhoto library, or Aper library.
  3. Right-click on the selected files and select View Package Contents.
  4. Drag the Photo Cache folder of the iPod/iPhone or the Photo Cache folder of the Apple TV to the Trash to delete it.
  5. Close the window and try to save the data.
  6. Check if the problem persists.

Windows :

  1. Press Windows + S on the keyboard to open the search bar.
  2. Type iPod/iPhone Photo Cache or Apple TV Photo Cache in the search bar and wait for the computer to finish searching.
  3. Right-click the folder and select Open Folder Location.
  4. Exit and select the folder.
  5. Press Shift + Del to permanently delete them.
  6. After that, try backing up the device and see if the problem persists.

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frequently asked questions

When you try to sync an iPhone, iPad, or iPod touch with a computer, the following warning message may appear: iPhone [device name] cannot be synced. This can happen if the file is locked on your computer or iOS or iPadOS device. Press OK to continue synchronization.

  1. Install the latest version of iTunes.
  2. Restart the computer.
  3. Check for updates on your Mac or PC.
  4. Try recovering the unit with another USB cable.
  5. Try restoring the product on another computer.
  6. Forces a reboot of the device.

After you launch iTunes, click Help -> Check for updates to make sure it’s the latest version. Connect the iPhone to the computer using a USB cable and launch iTunes on the computer. In this situation, iTunes will detect your iPhone in recovery mode and restore it.

An unknown error is a WebDriver error that occurs when an undefined error occurs in the driver during command processing. An unknown error is usually driver specific. It is therefore advisable to read any error message to get an idea of what happened.

frequently asked questions

What does it mean when iTunes says iPhone can’t sync?

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Cannot synchronize because iPhone cannot be found?

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Why are my iPad and iPhone not syncing?

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