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

MacBook Pro (M1 Max, 16-inch, 2021) · macOS 12.1

21C52Signed

Catalog data · Last updated: Oct 21, 2026, 3:55 PM UTC

Restore IPSW for MacBook Pro (M1 Max, 16-inch, 2021): macOS 12.1, build 21C52.

Firmware information

Version: macOS 12.1
Build: 21C52
IPSW: Mac restore IPSW, not a macOS installer
Size: 13.17 GB
Release date: Dec 13, 2021, 6:34 PM UTC
File name: UniversalMac_12.1_21C52_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_12.1_21C52_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-2568d3863cd4a09d5cfd75c4a3e61f7605d800f653b5ecd6e8628b19a44de6a67b0

SHA-104421498d4e6e031f2269c988a2663ebacb774e4

MD5f372884892c445b80993250b65f6bebb