FIRMWARE DETAILS

iOS 17.2.1

Build: 21C66Dec 19, 2023Restore IPSW

Stable

View details

Filename: iPhone15,3_17.2.1_21C66_Restore.ipsw
File size: 7.90 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: 956f4a84ba1de91e9fdb8c4c3f6f2ad5adbefcc4217be62f67a889381258379a
SHA-1: 636870f78995cb5aacd98a6e32f49b03c4035860
Required starting builds: Not reported
Board restrictions: Not reported

Compatible hardware (1)

iPhone 14 Pro Max iPhone15,3IPSW.me public API retrieval · Oct 23, 2026, 10:26 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/iPhone15%2C3?type=ipsw ↗

Public API; no blanket open-data license established
Last imported: Oct 19, 2026, 6:20 PM UTC
Record fingerprint: d1a8c7d666d60bfbffbbf16cb8a66c71

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

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