Developer Transition Kit · ADP3,2

Developer Transition Kit · macOS 11.2.1

20D74Signed

Catalog data · Last updated: Oct 21, 2026, 11:42 PM UTC

Restore IPSW for Developer Transition Kit: macOS 11.2.1, build 20D74.

Firmware information

Version: macOS 11.2.1
Build: 20D74
IPSW: Mac restore IPSW, not a macOS installer
Size: 12.76 GB
Release date: Feb 9, 2021, 6:54 PM UTC
File name: UniversalMac_11.2.1_20D74_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_11.2.1_20D74_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-2566d16fe550707f8644abf1178d581efc6cba59ef0ff8fa9180d8736370bc99680

SHA-1e86a28704fc5e46feeaa118660bb8dece33a936d

MD52f0f899d9eb35e84faac2134c3e0754f