FIRMWARE DETAILS

iOS 17.3.1

Build: 21D61Feb 8, 2024Restore IPSW

Stable

View details

Filename: iPhone16,1_17.3.1_21D61_Restore.ipsw
File size: 8.13 GB
File type: Restore IPSW
Download host: updates.cdn-apple.com
Link availability: Not verified
Source reports active
Last link check: Not checked
SHA-256: 5b4020427f1999e2712966af550bb140e6f1a6368d3ef3d4b165f52d35904231
SHA-1: 2f7ba9e61ad11214988b405c21f9ef211315d463
Required starting builds: Not reported
Board restrictions: Not reported

Compatible hardware (1)

iPhone 15 Pro iPhone16,1IPSW.me public API retrieval · Oct 20, 2026, 11:05 AM UTC

Unsigned

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

IPSW.mehttps://api.ipsw.me/v4/device/iPhone16%2C1?type=ipsw ↗

Public API; no blanket open-data license established
Last imported: Oct 19, 2026, 6:20 PM UTC
Record fingerprint: 3fed865afdb5aa31d875cf8f37d316c8