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FIRMWARE DETAILS

iOS 17.2.1

Build: 21C66Dec 19, 2023Delta OTA
Stable

View details

Filename
44294d61ffddb45476b273e23e847f5c1b25f854.zip
File size
3.72 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
b2e07f8c5a8e69d3a3718cff5fbe13e9985f94534a20c46413f1f0de69398688
SHA-1
f3c6abe1bdaaf842e979b7a3fd7026e7920ef246
Required starting builds
20C65, 20D47, 20D67
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