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FIRMWARE DETAILS

iOS 17.1

Build: 21B74Oct 25, 2023Full OTA
Release CandidateStable

View details

Filename
8d236c9f64d66c3a421b5e312df555ffe5f6fd53.zip
File size
6.26 GB
File type
Full OTA
Download host
updates.cdn-apple.com
Link availability
Not verified

Source reports active

Last link check
Not checked
SHA-256
5ac99e4947e85ad6206dc24080f1bbcf0fbc29a510797edbdf532ce13d2f473e
SHA-1
26bdace5b8abdedf57c8153b0ea2b0ed205744ca
Required starting builds
Not reported
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)

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%3B21B74.json ↗

MIT — copyright 2022 emiyl
Last imported: Oct 19, 2026, 6:28 PM UTC
Record fingerprint: ce1037df7218db6f4121eac6e89afc29

AppleDBhttps://api.appledb.dev/ios/iOS%3B21B74-RC.json ↗

MIT — copyright 2022 emiyl
Last imported: Oct 19, 2026, 6:28 PM UTC
Record fingerprint: 596792c64544009bb3cdf2ce13596537