FIRMWARE DETAILS

iOS 17.1 RC 2

Build: 21B77Oct 20, 2023Delta OTA

Release Candidate

View details

Filename: 8e4bbc7087168e9d0810b5b9f98033b9598c01ce.zip
File size: 362.3 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: 2fda9e478541f8680d4b89c5efd71ab0cda40cdbb14b87b6578bd5d8502122fb
SHA-1: acf8da2aed9878c6622025727d329907ea8f1ddf
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 Plus iPhone15,5

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