Mac Studio (M1 Ultra)
Signed macOS

macOS 12.3 (21E230)

Mac Studio (M1 Ultra)

Other Signed macOS Versions
macOS 26.4.1 Signed 25E253 macOS 26.4 Signed 25E246 macOS 26.3.1 Signed 25D2128 macOS 26.3 Signed 25D125 macOS 26.2 Signed 25C56 macOS 26.1 Signed 25B78 macOS 26.0.1 Signed 25A362 macOS 26.0 Signed 25A354 macOS 15.6.1 Signed 24G90 macOS 15.6 Signed 24G84 macOS 15.5 Signed 24F74 macOS 15.4.1 Signed 24E263 macOS 15.4 Signed 24E248 macOS 15.3.2 Signed 24D81 macOS 15.3.1 Signed 24D70 macOS 15.3 Signed 24D60 macOS 15.2 Signed 24C101 macOS 15.1.1 Signed 24B91 macOS 15.1 Signed 24B83 macOS 15.0.1 Signed 24A348 macOS 15.0 Signed 24A335 macOS 14.6.1 Signed 23G93 macOS 14.6 Signed 23G80 macOS 14.5 Signed 23F79 macOS 14.4.1 Signed 23E224 macOS 14.4 Signed 23E214 macOS 14.3.1 Signed 23D60 macOS 14.3 Signed 23D56 macOS 14.2.1 Signed 23C71 macOS 14.2 Signed 23C64 macOS 14.1.2 Signed 23B92 macOS 14.1.1 Signed 23B81 macOS 14.1 Signed 23B74 macOS 14.0 Signed 23A344 macOS 13.6 Signed 22G120 macOS 13.5.2 Signed 22G91 macOS 13.5.1 Signed 22G90 macOS 13.5 Signed 22G74 macOS 13.4.1 Signed 22F82 macOS 13.4 Signed 22F66 macOS 13.3.1 Signed 22E261 macOS 13.3 Signed 22E252 macOS 13.2.1 Signed 22D68 macOS 13.2 Signed 22D49 macOS 13.1 Signed 22C65 macOS 13.0.1 Signed 22A400 macOS 13.0 Signed 22A380 macOS 12.6 Signed 21G115 macOS 12.5.1 Signed 21G83 macOS 12.5 Signed 21G72 macOS 12.4 Signed 21F79 macOS 12.3.1 Signed 21E258

How to Restore macOS 12.3 IPSW

🖥

iTunes (Windows / macOS Mojave and older) & Finder (macOS Catalina+)

  1. Download the UniversalMac_12.3_21E230_Restore.ipsw file to your computer.
  2. Connect your Mac Studio (M1 Ultra) to your computer with a USB cable.
  3. Open Finder (macOS Catalina+) or iTunes (Windows / older macOS) and select your device.
  4. To Update (keeps data): hold Option (Mac) or Shift (Windows) and click Check for Update.
  5. To Restore (erases data): hold Option (Mac) or Shift (Windows) and click Restore iPhone/iPad.
  6. Navigate to and select the downloaded .ipsw file, then confirm.
  7. Wait for the process to complete — do not disconnect the device.
⌨️

idevicerestore (Command Line)

An open-source command-line tool that restores IPSW files without needing iTunes. Useful for advanced users, automation, and custom restore workflows.

  1. Install via Homebrew: brew install idevicerestore
  2. Connect your device and put it into DFU mode.
  3. Run the restore command:
idevicerestore -t UniversalMac_12.3_21E230_Restore.ipsw
Common flags:
-eErase restore (factory reset) -uUpdate restore (keep data) -dEnable debug output -nDry-run — don't actually restore
🔓

futurerestore (Saved Blobs / Downgrade)

futurerestore allows restoring to any firmware when you have saved APTickets (blobs) from a tool like TSSSaver or shsh.host.

  1. Download futurerestore from github.com/futurerestore/futurerestore.
  2. Ensure you have a saved .shsh2 blob for macOS 12.3 (21E230) on your Mac Studio (M1 Ultra).
  3. Put your device into DFU mode and run:
futurerestore -t your_blob.shsh2 --latest-sep --latest-baseband UniversalMac_12.3_21E230_Restore.ipsw
⛔ Warning: Using --latest-sep requires the latest SEP to be compatible with macOS 12.3. Always verify compatibility before restoring to avoid a bricked device.
📲

Entering DFU Mode

DFU (Device Firmware Update) mode is required for most manual restores. The button combination varies by device:

Mac Studio (M1 Ultra)
Connect device to computer, then follow the on-screen instructions in iTunes/Finder to enter DFU mode.

💡 Tip: In DFU mode the screen stays completely black. If you see the Apple logo or a "Connect to iTunes" screen, you entered Recovery mode instead — try again.

UniversalMac_12.3_21E230_Restore.ipsw
Device
Mac Studio (M1 Ultra)
Identifier
Mac13,2
OS
macOS
Version
12.3
Build
21E230
Release Date
2022-03-14
Upload Date
2022-03-01
Size
12.92 GB
Status
Signed
SHA1
b9e895b403586591040864d23643132c20ca7913
SHA256
0ceb505082b254d14a7eef406b48671c0abd7c943d25fa75ea2807ea17504006
MD5
ebc5b2018be0ae7833d528f22e4d2249
⇓ Download IPSW (12.92 GB)