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FIRMWARE DETAILS

iOS 17.2.1

Build: 21C66Dec 19, 2023Delta OTA
Stable

View details

Filename
a36c44a7bdb183a9e92b514056dfda14b7e232c9.zip
File size
4.69 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
ac167b077944f2d8fceea4df98a9cbae35ceb3a5c6022b49f0732f57ef836d29
SHA-1
eab292053b9b0e3bb2d2b2f07d283c44816a3f9c
Required starting builds
19H117, 19H12, 19H218
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