FIRMWARE DETAILS

iOS 17.2.1

Build: 21C66Dec 19, 2023Full OTA

Stable

View details

Filename: d1f2bc498325c48313c6d27ae9367c0dc4f1cfb6.zip
File size: 5.81 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: 5345bdfdd337f7a8a1a15510410fb5c40fb1cac9e0853112d79c1a88b5846f5a
SHA-1: 398d6d4f6722b02f3aa34dc75541903e56f77240
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 (1)

iPhone XR iPhone11,8

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