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

MacBook Pro (M1 Max, 16-inch, 2021) · macOS 27.0

26A428Signed

Catalog data · Last updated: Oct 22, 2026, 11:17 PM UTC

Restore IPSW for MacBook Pro (M1 Max, 16-inch, 2021): macOS 27.0, build 26A428.

Firmware information

Version: macOS 27.0
Build: 26A428
IPSW: Mac restore IPSW, not a macOS installer
Size: 24.8 GB
Release date: Sep 14, 2026, 5:19 PM UTC
File name: UniversalMac_27.0_26A428_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_27.0_26A428_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-2562a5d3c695d501022b7fad9adaffcf2627bcb867d993fb5662dcd41bac99a2836

SHA-12d17f2fe0d7726dd66f0522fdb9ad162942c3f3d

MD5d5a1f2c4dcb9b0ed974554c67aa6a4a1