MacBook Pro (M1 Max, 16-inch, 2021) · MacBookPro18,2

MacBook Pro (M1 Max, 16-inch, 2021) · macOS 12.3

21E230Signed

Catalog data · Last updated: Oct 23, 2026, 2:03 AM UTC

Restore IPSW for MacBook Pro (M1 Max, 16-inch, 2021): macOS 12.3, build 21E230.

Firmware information

Version: macOS 12.3
Build: 21E230
IPSW: Mac restore IPSW, not a macOS installer
Size: 12.92 GB
Release date: Mar 14, 2022, 5:19 PM UTC
File name: UniversalMac_12.3_21E230_Restore.ipsw
Download host: updates.cdn-apple.com

IPSW download

Check the model and signing status before downloading.

Download IPSW

Download hostupdates.cdn-apple.comUniversalMac_12.3_21E230_Restore.ipsw

Back up before you restore. A restore can erase the data on the device. The identifier has to match, and a file you can download may still be rejected for restore. This is Mac restore firmware, not a regular macOS installer. The restore steps depend on the model.

Checksum

SHA-2560ceb505082b254d14a7eef406b48671c0abd7c943d25fa75ea2807ea17504006

SHA-1b9e895b403586591040864d23643132c20ca7913

MD5ebc5b2018be0ae7833d528f22e4d2249