iOS 12.3.1 (16F203) 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.

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Download (3.1 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_12.3.1_16F203_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_12.3.1_16F203_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_12.3.1_16F203_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_12.3.1_16F203_Restore.ipsw -Algorithm SHA1
  3. The output of the command should match the following checksum: a168b1bc901fb64cf725ab0dcca183dd684770dc. 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_12.3.1_16F203_Restore.ipsw
  3. The output of the command should match the following checksum: a168b1bc901fb64cf725ab0dcca183dd684770dc. 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_12.3.1_16F203_Restore.ipsw
  3. The output of the command should match the following checksum: a168b1bc901fb64cf725ab0dcca183dd684770dc. If it doesn't, you may need to redownload the file.

Checksums

SHA256sum68ad422f97a94da2fecfe4c0b0773cfeab3c3515375c08f23a3f98bf64104345
MD5sum68ad422f97a94da2fecfe4c0b0773cfeab3c3515375c08f23a3f98bf64104345
SHA1suma168b1bc901fb64cf725ab0dcca183dd684770dc
Please note, the documentation below is supplied from Apple's update servers. We don't modify the contents of this documentation.

iOS 12.3.1 includes bug fixes for your iPhone and iPad. This update:

  • Fixes an issue that could prevent making or receiving VoLTE calls

  • Fixes issues in Messages that could cause messages from unknown senders to appear in your conversation list even though Filter Unknown Senders is enabled

  • Fixes an issue that could prevent the Report Junk link from appearing in Messages threads from unknown senders

For information on the security content of this update, please visit this website: https://support.apple.com/kb/HT201222

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