FIRMWARE DETAILS

iOS 17.4.1

Build: 21E236Mar 21, 2024Delta OTA

Stable

View details

Filename: c764631f1d57caa9bf0740dc89039f828e1090f7.zip
File size: 3.81 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: 3b8aa52675827af70c76ddd428badab3afc540b2be50d91eece1bc0fb38fef0a
SHA-1: 0a66d361b8b0d02a5bb79025ef1268189e0e7a8f
Required starting builds: 20A362, 20A380, 20A392
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 11 iPhone12,1

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%3B21E236.json ↗

MIT — copyright 2022 emiyl
Last imported: Oct 19, 2026, 6:28 PM UTC
Record fingerprint: 35d6f74f80d62b482e435ab6b7815260