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FIRMWARE DETAILS

iOS 17.1.1

Build: 21B91Nov 8, 2023Delta OTA
Stable

View details

Filename
13fa996a59193ca2ed077359480bdd0dcb253a50.zip
File size
3.55 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
04a9a176645a3a4a484f46374624d95800b698a8b16313573c1d9b42f5ce5174
SHA-1
82c976791c55fd6783eb6e0ddb5bccfd5e30d578
Required starting builds
20F66, 20F75
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