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FIRMWARE DETAILS

iOS 17.1

Build: 21B74Oct 25, 2023Delta OTA
Release CandidateStable

View details

Filename
f2526df4e698d2e43b95081a4a7828485d21bbd0.zip
File size
4.76 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
a9bafe04793c7499bfb62ab0a9502abe235d30050f0c2affe0e3597b50734614
SHA-1
2fa7a5deda29412ba37854c69296b02de6a16cc0
Required starting builds
19H117, 19H12, 19H218
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