iBridge2,21 · iBridge2,21

iBridge2,21 · bridgeOS 5.5

18P4759aUnsigned

Catalog data · Last updated: Oct 21, 2026, 6:11 PM UTC

Restore IPSW for iBridge2,21: bridgeOS 5.5, build 18P4759a.

Firmware information

Version: bridgeOS 5.5
Build: 18P4759a
IPSW: Restore IPSW
Size: 0.56 GB
Release date: Jul 21, 2021, 5:25 PM UTC
File name: iBridge2,1,iBridge2,10,iBridge2,12,iBridge2,14,iBridge2,15,iBridge2,16,iBridge2,19,iBridge2,20,iBridge2,21,iBridge2,22,iBridge2,3,iBridge2,4,iBridge2,5,iBridge2,6,iBridge2,7,iBridge2,8_5.5_18P4759a_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,iBridge2,12,iBridge2,14,iBridge2,15,iBridge2,16,iBridge2,19,iBridge2,20,iBridge2,21,iBridge2,22,iBridge2,3,iBridge2,4,iBridge2,5,iBridge2,6,iBridge2,7,iBridge2,8_5.5_18P4759a_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-256f29778355175b48372839deaaed6222c350198865d48e17caea208ec1355957d

SHA-1f3e1f3bec574e724eb0624f063e38c3d3fb36a69

MD5d4c370f6c9a60cda6006fc1d92bb6ae4