IPSW Downloads

iOS 17.2.1 - 21C66 for iPhone XS Max

This firmware is not signed. This means you cannot restore to it in iTunes.

Release Date19 December 2023
Upload Date16 December 2023
File NameiPhone11,2,iPhone11,4,iPhone11,6_17.2.1_21C66_Restore.ipsw
File Size7.09 GB
SHA256sum421fb0c427f623eebcc881dc540fdf350a5a477bab7de44cb46e48dbccaaef4c
MD5suma857e38c18a282b7516cec889e538275
SHA1sumd10a44b5cbef3609331975eee3465ff630f1d7da
IdentifieriPhone11,4

Installation Instructions

Windows

  1. Install the latest version of iTunes from the Microsoft Store.
  2. Connect your iPhone XS Max to your PC.
  3. Open iTunes and navigate to your iPhone XS Max.
  4. Hold the Shift key and click "Restore".
  5. Select the iPhone11,2,iPhone11,4,iPhone11,6_17.2.1_21C66_Restore.ipsw file you downloaded.
  6. Wait for the restore to complete and for your iPhone XS Max to reboot.

macOS

  1. Connect your iPhone XS Max to your Mac.
  2. Navigate to your iPhone XS Max in Finder.
  3. Hold the Option or Alt key and click "Restore".
  4. Select the iPhone11,2,iPhone11,4,iPhone11,6_17.2.1_21C66_Restore.ipsw file you downloaded.
  5. Wait for the restore to complete and for your iPhone XS Max to reboot.

Linux

  1. Install idevicerestore.
  2. Connect your iPhone XS Max to your PC.
  3. Open a terminal and navigate to the IPSW file you downloaded, e.g., cd ~/Downloads.
  4. To perform a full erase restore, type idevicerestore -e iPhone11,2,iPhone11,4,iPhone11,6_17.2.1_21C66_Restore.ipsw and press Enter.
  5. Wait for the restore to complete and for your iPhone XS Max to reboot.