FIRMWARE DETAILS

iOS 17.3.1

Build: 21D61Feb 8, 2024Full OTA

Stable

View details

Filename: 6a0bcdf033c7cfc258eddc5cbdeb993ee7b1997d.zip
File size: 6.24 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: 3edd0d1c1d89ae4dc61fde84d783093b8d27f820b88d1bcb68aaf40a2e506d96
SHA-1: 56c80d3bbb42bf4d17445edfefc41e4cc53b721c
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 15 iPhone15,4

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%3B21D61.json ↗

MIT — copyright 2022 emiyl
Last imported: Oct 19, 2026, 6:28 PM UTC
Record fingerprint: caa4c3b8f1108221a1cf4826799a13ca