FIRMWARE DETAILS

iOS 17.1

Build: 21B74Oct 25, 2023Full OTA

Release CandidateStable

View details

Filename: bfd74eff5285c7db3fcee326165c8c26c9444546.zip
File size: 6.48 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: bd3278fa0406de320ec31f5b060b8879bb0dc274ad575ce913e6d36e181f16c5
SHA-1: 152af20a704cadad0036c7a84cbd1d5f0909231a
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 Pro Max iPhone16,2

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