Developer Transition Kit · ADP3,2

Developer Transition Kit · macOS 11.2.3

20D91Signed

Catalog data · Last updated: Oct 21, 2026, 7:56 PM UTC

Restore IPSW for Developer Transition Kit: macOS 11.2.3, build 20D91.

Firmware information

Version: macOS 11.2.3
Build: 20D91
IPSW: Mac restore IPSW, not a macOS installer
Size: 12.77 GB
Release date: Mar 8, 2021, 6:14 PM UTC
File name: UniversalMac_11.2.3_20D91_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_11.2.3_20D91_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-2563873efdc08c71af06b8d5ad1d2fda0d509746cc29e568e90732ccbe614af5a9f

SHA-147409e45ec6d9b6a15d9a49563572914f222104e

MD521c98b937bce0285abde8b39d1069409