FIRMWARE DETAILS

iOS 17.2.1

Build: 21C66Dec 19, 2023Restore IPSW

Stable

View details

Filename: iPhone13,4_17.2.1_21C66_Restore.ipsw
File size: 7.78 GB
File type: Restore IPSW
Download host: updates.cdn-apple.com
Link availability: Not verified
Source reports active
Last link check: Not checked
SHA-256: e54c05c5a383ba9845713b057117e56d576fca3601d892f1f36ef635b050731e
SHA-1: 2a31d3bbab2031bcd7b0cd6620b8874bf0e3d2cf
Required starting builds: Not reported
Board restrictions: Not reported

Compatible hardware (1)

iPhone 12 Pro Max iPhone13,4IPSW.me public API retrieval · Oct 20, 2026, 7:55 AM UTC

Unsigned

Signing is specific to the device and file. A signed build does not guarantee a downgrade or successful installation.

Source provenance

IPSW.mehttps://api.ipsw.me/v4/device/iPhone13%2C4?type=ipsw ↗

Public API; no blanket open-data license established
Last imported: Oct 19, 2026, 6:20 PM UTC
Record fingerprint: 2eccc44bab08838e408457777be1c9c3

AppleDBhttps://api.appledb.dev/ios/iOS%3B21C66.json ↗

MIT — copyright 2022 emiyl
Last imported: Oct 19, 2026, 6:28 PM UTC
Record fingerprint: d446c7f095cdf40f999162af3ba1751c