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FIRMWARE DETAILS

iOS 17.5

Build: 21F79May 13, 2024Delta OTA
Release CandidateStable

View details

Filename
c959bb778d8429fd9a6bc38e2518554896dbfe7f.zip
File size
1.55 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
e3e250a94c895c26bf8647f65571c86446550eefab20a7a1f7082aa91ddc8a9d
SHA-1
3fa6ce194525d8f56cd059c3c18a140e0022d7ae
Required starting builds
21C62, 21C66
Board restrictions
Not reported

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

Compatible hardware (1)

iPhone XR iPhone11,8
Unknown

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

Source provenance

AppleDBhttps://api.appledb.dev/ios/iOS%3B21F79.json ↗

MIT — copyright 2022 emiyl
Last imported: Oct 19, 2026, 6:28 PM UTC
Record fingerprint: fad1f444ed45a9b0b4e75442c2a737cc

AppleDBhttps://api.appledb.dev/ios/iOS%3B21F79-RC.json ↗

MIT — copyright 2022 emiyl
Last imported: Oct 19, 2026, 6:28 PM UTC
Record fingerprint: 2cce62a34025b5a2ae1d1605ae45809f