FIRMWARE DETAILS

iOS 26.5.1

Build: 23F81Jun 1, 2026Delta OTA

Stable

View details

Filename: 0c528a973f3d4ebfd4d300ea87770e00e5071979714a6f9ceacd46e6260cde78.aea
File size: 3.62 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: f793cb33cbf4f41d29a6416416bdc4650e701c88d2c1c2eea4eea60a78923cb0
SHA-1: 1eb96461a4d7c093af6a73211dac456af5c761b9
Required starting builds: 23C52, 23C55, 23C71
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