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FIRMWARE DETAILS

iOS 17.1

Build: 21B74Oct 25, 2023Delta OTA
Release CandidateStable

View details

Filename
e6345bb93a6f0f3ffc78a274feec7d6aabe2a336.zip
File size
4.44 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
64bf5d803d4c6ae3856ca4b33dec368490856a879b80e60a3c7b36fb6f6ae784
SHA-1
86753d9255c7a8a5a353664d2428c159eca48ef8
Required starting builds
19A340, 19A344, 19A346, 19A348, 19A404
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