FIRMWARE DETAILS

iOS 17.1 RC 2

Build: 21B77Oct 20, 2023Delta OTA

Release Candidate

View details

Filename: b7ad49a74e930d53895d3b86e3db08737a14c2ef.zip
File size: 363.7 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: 698cead0dc29fa39e76a82fdb977a8a8190809f854a55c59f8f681a5f1a87d94
SHA-1: 4ba7df5ff81a06c5872a530583eee8875733c04d
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)

iPhone 15 Pro iPhone16,1

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