FIRMWARE DETAILS

iOS 17.1

Build: 21B74Oct 25, 2023Full OTA

Release CandidateStable

View details

Filename: a661005a64ad6b7de9bd2c19cc8274c79a6f6976.zip
File size: 6.33 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: 6871187c5ab400d854433c3bcef3882d7cb578c7df62be43c7b2802c146ff9cc
SHA-1: e180f0610123ad6fc62829075c00f12a2e58fa8d
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)

iPhone 15 iPhone15,4

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-RC.json ↗

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