FIRMWARE DETAILS

iOS 17.3.1

Build: 21D61Feb 8, 2024Full OTA

Stable

View details

Filename: 439a61c30a8ed3eeb63ff596b4e46dab157b995f.zip
File size: 5.99 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: 59f56661eb476f4596953de222c911961a052ffa25f700ca7a291aaa9835b57e
SHA-1: 31cd115b3e7b41dd9e80a56994806ff6338ace16
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 (3)

iPhone XS iPhone11,2

Unknown

iPhone XS Max iPhone11,6

Unknown

iPhone XS Max (China mainland) iPhone11,4

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