iBridge2,21 · iBridge2,21

iBridge2,21 · bridgeOS 4.4

17P4538Unsigned

Catalog data · Last updated: Oct 21, 2026, 3:25 PM UTC

Restore IPSW for iBridge2,21: bridgeOS 4.4, build 17P4538.

Firmware information

Version: bridgeOS 4.4
Build: 17P4538
IPSW: Restore IPSW
Size: 0.51 GB
Release date: May 4, 2020, 3:24 PM UTC
File name: iBridge2,1,iBridge2,10,iBridge2,11,iBridge2,12,iBridge2,13,iBridge2,14,iBridge2,15,iBridge2,16,iBridge2,21,iBridge2,3,iBridge2,4,iBridge2,5,iBridge2,6,iBridge2,7,iBridge2,8_4.4_17P4538_Restore.ipsw
Download host: updates.cdn-apple.com

IPSW download

Check the model and signing status before downloading.

Download IPSW

Download hostupdates.cdn-apple.com

iBridge2,1,iBridge2,10,iBridge2,11,iBridge2,12,iBridge2,13,iBridge2,14,iBridge2,15,iBridge2,16,iBridge2,21,iBridge2,3,iBridge2,4,iBridge2,5,iBridge2,6,iBridge2,7,iBridge2,8_4.4_17P4538_Restore.ipsw

The catalog marks this build as unsigned. A normal restore may not be accepted.

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. bridgeOS belongs to the matching Mac hardware and is not a macOS installer.

Checksum

SHA-25687a5bda842730a0a1047fc50a73bbecfe3c76bb367db63d64b1d6d2d8a3f1e85

SHA-1d27adc68d2e57f5da1e863f102faaa62c5b1411a

MD5ae0dc7a944a3efd3774f994d8f434662