FIRMWARE DETAILS

iOS 26.5.1

Build: 23F81Jun 1, 2026Delta OTA

Stable

View details

Filename: 1b8c7ca9cd27fb34fcc35c3213cdef8e995b45a8e4d1d6052798b5c578e1f913.aea
File size: 1.41 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: 7b5e580d329449c2276ae363578186e0d426c097f9f2362f03ccbae1c3cc48a4
SHA-1: 5463f3ce269102389fa93b66dd23a0d342f534ba
Required starting builds: 23E246, 23E254, 23E261
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