iBridge2,21 · iBridge2,21

iBridge2,21 · bridgeOS 5.3

18P4556Unsigned

Catalog data · Last updated: Oct 21, 2026, 5:56 PM UTC

Restore IPSW for iBridge2,21: bridgeOS 5.3, build 18P4556.

Firmware information

Version: bridgeOS 5.3
Build: 18P4556
IPSW: Restore IPSW
Size: 0.56 GB
Release date: Apr 26, 2021, 5:48 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_5.3_18P4556_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_5.3_18P4556_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-2562780cb0a2b2f2053a887d656115dd8b2b96a670f3446e29ac3f667ef6472b248

SHA-16e52a358ea3868af3632c7e771a5ae3cb5efcbb5

MD521487b0ef750d9c3e00edf83a17b6f3d