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FIRMWARE DETAILS

iOS 17.2.1

Build: 21C66Dec 19, 2023Restore IPSW
Stable

View details

Filename
iPhone12,3,iPhone12,5_17.2.1_21C66_Restore.ipsw
File size
7.46 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
e135107807517e6f60202a26806cf7ea7ee625b1bbbb59d8b966414af0ff92a5
SHA-1
6b0be6e23dedcf9c3f43b983a99102a383fed499
Required starting builds
Not reported
Board restrictions
Not reported

Compatible hardware (2)

iPhone 11 Pro iPhone12,3IPSW.me v4 third-party restore observation (retrieval time) · Oct 19, 2026, 10:59 PM UTC
Unknown
iPhone 11 Pro Max iPhone12,5IPSW.me v4 third-party restore observation (retrieval time) · Oct 19, 2026, 10:59 PM UTC
Unknown

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/iPhone12%2C3?type=ipsw ↗

Public API; no blanket open-data license established
Last imported: Oct 19, 2026, 6:20 PM UTC
Record fingerprint: 6984be597a952dfea3d41f1b0a7a9a07

IPSW.mehttps://api.ipsw.me/v4/device/iPhone12%2C5?type=ipsw ↗

Public API; no blanket open-data license established
Last imported: Oct 19, 2026, 6:20 PM UTC
Record fingerprint: d7667e03d17ab4299cf038c4a237494a

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

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