iOS 15.3.1 (19D52) for iPhone 6s+

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iPhone 6s+

✗ This firmware is not signed. This means you cannot restore to it in Finder, the Apple Devices app, iTunes, or idevicerestore.

Your download should begin shortly. If it does not, you can download it directly here:

Download (5.2 GiB)

This firmware is not signed. This means you cannot restore to it in Finder, the Apple Devices app, iTunes, or idevicerestore. The instructions below are included for reference only.

Windows

  1. Install the latest version of Apple Devices from the Microsoft Store.
  2. Plug your iPhone 6s+ in to your PC.
  3. Open Apple Devices, and navigate to your iPhone 6s+.
  4. Hold the Shift key on your keyboard, and press "Restore".
  5. Select the iPhone_5.5_15.3.1_19D52_Restore.ipsw file that you downloaded.
  6. Wait for the restore to complete, and the iPhone 6s+ to reboot.

macOS

  1. Plug your iPhone 6s+ in to your Mac.
  2. Navigate to your iPhone 6s+ in Finder.
  3. Hold the Option or Alt key on your keyboard, and press "Restore".
  4. Select the iPhone_5.5_15.3.1_19D52_Restore.ipsw file that you downloaded.
  5. Wait for the restore to complete, and the iPhone 6s+ to reboot.

Linux

  1. Install idevicerestore.
  2. Plug your iPhone 6s+ in to your PC.
  3. Open a terminal, and navigate to the IPSW file that you downloaded, e.g. cd ~/Downloads
  4. To perform a full erase restore, type idevicerestore -e iPhone_5.5_15.3.1_19D52_Restore.ipsw and press enter.
  5. Wait for the restore to complete, and the iPhone 6s+ to reboot.

Windows

  1. Open PowerShell, and navigate to the IPSW file that you downloaded, e.g. cd Downloads
  2. Type Get-FileHash iPhone_5.5_15.3.1_19D52_Restore.ipsw -Algorithm SHA1
  3. The output of the command should match the following checksum: ec4163cc47dc688b58541c00f190f942e2db3101. If it doesn't, you may need to redownload the file.

macOS

  1. Open a terminal, and navigate to the IPSW file that you downloaded, e.g. cd ~/Downloads
  2. Type openssl sha1 iPhone_5.5_15.3.1_19D52_Restore.ipsw
  3. The output of the command should match the following checksum: ec4163cc47dc688b58541c00f190f942e2db3101. If it doesn't, you may need to redownload the file.

Linux

  1. Open a terminal, and navigate to the IPSW file that you downloaded, e.g. cd ~/Downloads
  2. Type openssl sha1 iPhone_5.5_15.3.1_19D52_Restore.ipsw
  3. The output of the command should match the following checksum: ec4163cc47dc688b58541c00f190f942e2db3101. If it doesn't, you may need to redownload the file.

Checksums

SHA256sumf0b9f27b497ebc88a29e0dc62a52bd92bdc6a7069808b450fa68fbbcd2523954
MD5sumf0b9f27b497ebc88a29e0dc62a52bd92bdc6a7069808b450fa68fbbcd2523954
SHA1sumec4163cc47dc688b58541c00f190f942e2db3101
Please note, the documentation below is supplied from Apple's update servers. We don't modify the contents of this documentation.

iOS 15.3.1 provides important security updates for your iPhone and fixes an issue that may cause Braille displays to stop responding.

For information on the security content of Apple software updates, please visit this website:

https://support.apple.com/kb/HT201222

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