FIRMWARE DETAILS

iOS 17.3.1

Build: 21D61Feb 8, 2024Restore IPSW

Stable

View details

Filename: iPhone15,4_17.3.1_21D61_Restore.ipsw
File size: 7.95 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: 6220c321a50777ac071e0bf1fef138017c5ab24d24973178e32d823756ede3f5
SHA-1: c1345d505d034f470fa05fcc8026a4d58dd8b63c
Required starting builds: Not reported
Board restrictions: Not reported

Compatible hardware (1)

iPhone 15 iPhone15,4IPSW.me public API retrieval · Oct 23, 2026, 7:51 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/iPhone15%2C4?type=ipsw ↗

Public API; no blanket open-data license established
Last imported: Oct 19, 2026, 6:20 PM UTC
Record fingerprint: e25b5610e716ed5cbd3d62db54824181