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FIRMWARE DETAILS

iOS 17.2.1

Build: 21C66Dec 19, 2023Delta OTA
Stable

View details

Filename
e10801eab8e8d238ac59e3f852520bb617a23275.zip
File size
3.91 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
daea9273390f8d8d1d6d84aa5328d731a16ce48e933ce20666daeaa81d564a0c
SHA-1
4b540ad9c4d53c2321c4367b1e1c9d4ea372c396
Required starting builds
20G75, 20G81, 20H19, 20H30
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