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FIRMWARE DETAILS

iOS 17.1

Build: 21B74Oct 25, 2023Delta OTA
Release CandidateStable

View details

Filename
bb0376cd90d008cc16cee46a122141b53999ac53.zip
File size
3.86 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
961f4137641f59fd7458f6210f87b3b99aaddacba6f28dc1da52b4c90e8ddcfc
SHA-1
2f0404a2cb74a49dc9fa21ee8bce7bd3b1820d8b
Required starting builds
20C65, 20D47, 20D67
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