FIRMWARE DETAILS

iOS 26.5.1

Build: 23F81Jun 1, 2026Restore IPSW

Stable

View details

Filename: iPhone18,4_26.5.1_23F81_Restore.ipsw
File size: 11.04 GB
File type: Restore IPSW
Download host: updates.cdn-apple.com
Link availability: Not verified
Source reports active
Last link check: Not checked
SHA-256: 5a5f57c78696d824de81f20f2ba4bf31125b3721ac55ddde5d65790897efef2d
SHA-1: d42f24d7cfb634bc7d636b1701c092ac8c684e79
Required starting builds: Not reported
Board restrictions: Not reported

Compatible hardware (1)

iPhone Air iPhone18,4IPSW.me public API retrieval · Oct 23, 2026, 10:35 AM UTC

Unsigned

Signing is specific to the device and file. A signed build does not guarantee a downgrade or successful installation.

Source provenance

IPSW.mehttps://api.ipsw.me/v4/device/iPhone18%2C4?type=ipsw ↗

Public API; no blanket open-data license established
Last imported: Oct 19, 2026, 6:20 PM UTC
Record fingerprint: 4ce139cb005ba562ea7d6a01cdbffbdd

AppleDBhttps://api.appledb.dev/ios/iOS%3B23F81.json ↗

MIT — copyright 2022 emiyl
Last imported: Oct 19, 2026, 6:25 PM UTC
Record fingerprint: 5c942573abf0119b4e5bd563e9638914