FIRMWARE DETAILS

iOS 17.2.1

Build: 21C66Dec 19, 2023Full OTA

Stable

View details

Filename: 2e8a26f97f86aad5d7da4b4c6fd5e4bf6551243d.zip
File size: 6.18 GB
File type: Full OTA
Download host: updates.cdn-apple.com
Link availability: Not verified
Source reports active
Last link check: Not checked
SHA-256: e7e9153a8ba518401928160c723fde2532b52832be87b3404626e5d40f39b23d
SHA-1: 77824addbe65eabbd589f40c3135a39225454611
Required starting builds: Not reported
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 (2)

iPhone 12 iPhone13,2

Unknown

iPhone 12 Pro iPhone13,3

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