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FIRMWARE DETAILS

iOS 17.2.1

Build: 21C66Dec 19, 2023Delta OTA
Stable

View details

Filename
a9eddb0eec7688271379995de8ca8ae25107239a.zip
File size
5.14 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
8b672b02a74bd62255bb541b8d87794ffc27bb576e3ee0a1a7c20b3bdd64d159
SHA-1
3650ec70811b7293b1ff45364b179a0259dba0f7
Required starting builds
18E198, 18E199, 18E212, 18F72
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