FIRMWARE DETAILS

iOS 26.5.1

Build: 23F81Jun 1, 2026Delta OTA

Stable

View details

Filename: c2c660417c7d0a5b28c10e87f6230bc7f2f1b55670bc1a5ae90a71957fff7069.aea
File size: 2.95 GB
File type: Delta OTA
Download host: updates.cdn-apple.com
Link availability: Not verified
Source reports active
Last link check: Not checked
SHA-256: d57286a87ee28d2eece74801d640ac4dea9c5c69bef4b0121645bada0c3a4339
SHA-1: acc4f9f55e327c00bf6d04ebf6d588c7e54fc061
Required starting builds: 23D125, 23D127
Board restrictions: Not reported

OTA packages can require an exact starting build and board. A matching hardware identifier alone is not sufficient for installation.

iPhone Air iPhone18,4

Unknown

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

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