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FIRMWARE DETAILS

iOS 17.1

Build: 21B74Oct 25, 2023Delta OTA
Release CandidateStable

View details

Filename
f813b1eea6625ef7315a52e529e55082c1e9fb7c.zip
File size
1.05 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
5dcd33901cce1f98a30cc48598f715056826e251ddf6b8c67ce9d033d7d5bf04
SHA-1
60761159e54e9d835962afe19a33ec28a1f65aff
Required starting builds
21A340, 21A351
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