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FIRMWARE DETAILS

macOS 12.3.1

Build: 21E258Mar 31, 2022Restore IPSW
Stable

View details

Filename
UniversalMac_12.3.1_21E258_Restore.ipsw
File size
13.88 GB
File type
Restore IPSW
Download host
updates.cdn-apple.com
Link availability
Not verified

Source did not report availability

Last link check
Not checked
SHA-256
cb0443525571ea5e54aa5a8fd9c52774591892311405183741f4a02f993e18d5
SHA-1
81033c922c5d43f57907d063fb01865f4c856b37
Required starting builds
Not reported
Board restrictions
Not reported

Compatible hardware (2)

Mac Studio (M1 Max) Mac13,1IPSW.me v4 third-party restore observation (retrieval time) · Oct 19, 2026, 10:59 PM UTC
Unknown
Mac Studio (M1 Ultra) Mac13,2IPSW.me v4 third-party restore observation (retrieval time) · Oct 19, 2026, 10:59 PM UTC
Unknown

Signing is specific to the device and file. A signed build does not guarantee a downgrade or successful installation.

Source provenance

IPSW.mehttps://api.ipsw.me/v4/device/Mac13%2C2?type=ipsw ↗

Public API; no blanket open-data license established
Last imported: Oct 19, 2026, 6:18 PM UTC
Record fingerprint: 425432d53ec87fc653fa1fd3205338ae

IPSW.mehttps://api.ipsw.me/v4/device/Mac13%2C1?type=ipsw ↗

Public API; no blanket open-data license established
Last imported: Oct 19, 2026, 6:18 PM UTC
Record fingerprint: 158f9a4749a1dc4d57998f9498cfef7f