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FIRMWARE DETAILS

iOS 17.2.1

Build: 21C66Dec 19, 2023Delta OTA
Stable

View details

Filename
99e3b801996cd94e07c0a65f994bd7d96047f113.zip
File size
1.39 GB
File type
Delta OTA
Download host
updates.cdn-apple.com
Link availability
Not verified

Source reports active

Last link check
Not checked
SHA-256
c5aac36cc0fbd4354a867af6b239cbf5505fc5c483218214c38ae5a636ff7ce8
SHA-1
b555d772155dbbd8f17483994bb04e9e8ba8b5de
Required starting builds
21A326, 21A329, 21A360
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)

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%3B21C66.json ↗

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