FIRMWARE DETAILS

iOS 26.5.1

Build: 23F81Jun 1, 2026Delta OTA

Stable

View details

Filename: f6de7b4a671ec0996d2a22ac3dccdf82d2a9967ef46e51986da864e9ed8fb4d3.aea
File size: 3.49 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: bb2338909faaee4ca57dd6a07e200bd8d5d6142f9f137f5be79c0ada1ed94bcc
SHA-1: 7ee1d1a3c5035d9b3f29a58c3b3fbb8c86470e13
Required starting builds: 23B82, 23B85
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 17 Pro Max iPhone18,2

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