iOS 27.2.1 (24B91034) for iPhone Duo iPhone Duo

1 Choose a product
2 Choose a device
3 Choose a version
4 Download

✓ This firmware is signed. This means that you can 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 (12 GiB)

Windows

  1. Install the latest version of Apple Devices from the Microsoft Store.
  2. Plug your iPhone Duo in to your PC.
  3. Open Apple Devices, and navigate to your iPhone Duo.
  4. Hold the Shift key on your keyboard, and press "Restore".
  5. Select the iPhone19,4_27.2.1_24B91034_Restore.ipsw file that you downloaded.
  6. Wait for the restore to complete, and the iPhone Duo to reboot.

macOS

  1. Plug your iPhone Duo in to your Mac.
  2. Navigate to your iPhone Duo in Finder.
  3. Hold the Option or Alt key on your keyboard, and press "Restore".
  4. Select the iPhone19,4_27.2.1_24B91034_Restore.ipsw file that you downloaded.
  5. Wait for the restore to complete, and the iPhone Duo to reboot.

Linux

  1. Install idevicerestore.
  2. Plug your iPhone Duo 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 iPhone19,4_27.2.1_24B91034_Restore.ipsw and press enter.
  5. Wait for the restore to complete, and the iPhone Duo to reboot.

Windows

  1. Open PowerShell, and navigate to the IPSW file that you downloaded, e.g. cd Downloads
  2. Type Get-FileHash iPhone19,4_27.2.1_24B91034_Restore.ipsw -Algorithm SHA1
  3. The output of the command should match the following checksum: 92363475465b48ae8e587914347daf12838c690f. 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 iPhone19,4_27.2.1_24B91034_Restore.ipsw
  3. The output of the command should match the following checksum: 92363475465b48ae8e587914347daf12838c690f. 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 iPhone19,4_27.2.1_24B91034_Restore.ipsw
  3. The output of the command should match the following checksum: 92363475465b48ae8e587914347daf12838c690f. If it doesn't, you may need to redownload the file.

Checksums

SHA256sumfd1fa0b2634c5cf8db44a7578890ce4bddd3852ca03bb99d4ebe6b2c36382645
MD5sumeed156c2d0cf6f0b775caad256c00d17
SHA1sum92363475465b48ae8e587914347daf12838c690f
Please note, the documentation below is supplied from Apple's update servers. We don't modify the contents of this documentation.

This update provides bug fixes and security updates for your iPhone.

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

https://support.apple.com/100100

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