FIRMWARE DETAILS

iOS 17.1 RC 2

Build: 21B77Oct 20, 2023Delta OTA

Release Candidate

View details

Filename: c7ddb7bd6104dc20249ed3c0b9395ea1f4ab5af7.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: a9cdc5f51cc194e1de511475439ff76a111b480571c473273a234503c0492bd6
SHA-1: 5d0ee155d90385c4082c74dc0fc79e354e0311f2
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 iPhone15,4

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