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FIRMWARE DETAILS

iOS 17.1.1

Build: 21B91Nov 8, 2023Delta OTA
Stable

View details

Filename
18d4c7022ea7e7dbcd6fe0934e3f3fe94427c65c.zip
File size
397.0 MB
File type
Delta OTA
Download host
updates.cdn-apple.com
Link availability
Not verified

Source reports active

Last link check
Not checked
SHA-256
b75d6d26c8f47aef6a2ff749dac4e3dc2b751b3bc7dffebe3ade2c3574ef5646
SHA-1
dda2e92b4765b393122cf08a093414b33cc5d535
Required starting builds
21B74
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%3B21B91.json ↗

MIT — copyright 2022 emiyl
Last imported: Oct 19, 2026, 6:28 PM UTC
Record fingerprint: 920b0a70bb6d0ccadee92018f5db3f40