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FIRMWARE DETAILS

iOS 17.1

Build: 21B74Oct 25, 2023Delta OTA
Release CandidateStable

View details

Filename
fe8435d8e2ef9754fac4009414bb28af54a4c4da.zip
File size
4.06 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
bac1fcd7a14569ed5c5194d828d5013360a353961a07ad9cc2b7e1d067e068df
SHA-1
82819c50da61609b02978c8f10711577410a4a22
Required starting builds
20B101, 20B110, 20B82
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