FIRMWARE DETAILS

iOS 17.4.1

Build: 21E236Mar 21, 2024Delta OTA

Stable

View details

Filename: 18e5a979c47f8a9ed158665181479c422e37367a.zip
File size: 1.85 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: 285a3eac7b864c02bcb270efea3be37dc09f2c8ae5ff1d2e0773037ac41f917a
SHA-1: dd8285a7ce496e532ad3b7dd9df0763815280292
Required starting builds: 21A340, 21A351
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 13 iPhone14,5

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