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FIRMWARE DETAILS

iOS 17.1 RC 2

Build: 21B77Oct 20, 2023Delta OTA
Release Candidate

View details

Filename
8f9b9222967051466ecd192098de133aefd05f84.zip
File size
363.9 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
6d7650f61064a2dd758690aea060d81e71487fd97b1352ddc90a0a99f2c379b2
SHA-1
11f95ce62123cbe8a73e1848156709d0296679f5
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%3B21B77.json ↗

MIT — copyright 2022 emiyl
Last imported: Oct 19, 2026, 6:28 PM UTC
Record fingerprint: 82d6a11eb2b28ab06384f2fe4e92790b