Download macOS 13.3.1 for MacBook Pro (M1 Max, 14-inch, 2021) (MacBookPro18,4)

Signed IPSW files can be restored via iTunes, 3uTools. Unsigned IPSWs cannot currently be restored via iTunes, 3uTools.

Signed status can change daily, you should check signed status before restored

Firmware information
  • File name
  • Version
    macOS 13.3.1 This firmware is signed. You can restore to it
  • Build ID
    22E261
  • Size
    11.85GB
  • Release date
    2023-04-07 17:14:23
  • Upload date
    2023-04-03 20:07:16
  • MD5
  • SHA1
  • SHA256
Mac MacBook Pro (M1 Max, 14-inch, 2021) MacBookPro18,4
* Apple server is official from Apple. Other links are re-upload to other hosts.