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FIRMWARE DETAILS

iOS 17.2.1

Build: 21C66Dec 19, 2023Restore IPSW
Stable

View details

Filename
iPhone11,2,iPhone11,4,iPhone11,6_17.2.1_21C66_Restore.ipsw
File size
7.61 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
421fb0c427f623eebcc881dc540fdf350a5a477bab7de44cb46e48dbccaaef4c
SHA-1
d10a44b5cbef3609331975eee3465ff630f1d7da
Required starting builds
Not reported
Board restrictions
Not reported

Compatible hardware (3)

iPhone XS iPhone11,2IPSW.me v4 third-party restore observation (retrieval time) · Oct 19, 2026, 10:59 PM UTC
Unknown
iPhone XS Max iPhone11,6IPSW.me v4 third-party restore observation (retrieval time) · Oct 19, 2026, 10:59 PM UTC
Unknown
iPhone XS Max (China mainland) iPhone11,4IPSW.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/iPhone11%2C4?type=ipsw ↗

Public API; no blanket open-data license established
Last imported: Oct 19, 2026, 10:59 PM UTC
Record fingerprint: 3a2dd04a5677e5ea15c2a9785638bdc1

IPSW.mehttps://api.ipsw.me/v4/device/iPhone11%2C2?type=ipsw ↗

Public API; no blanket open-data license established
Last imported: Oct 19, 2026, 10:59 PM UTC
Record fingerprint: 8f7be2c1cca7792d3bf1751b70ae1786

IPSW.mehttps://api.ipsw.me/v4/device/iPhone11%2C6?type=ipsw ↗

Public API; no blanket open-data license established
Last imported: Oct 19, 2026, 10:59 PM UTC
Record fingerprint: 9f6469f28deb7033c4a0384d2d0ceb75

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

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