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FIRMWARE DETAILS

iOS 17.3.1

Build: 21D61Feb 8, 2024Delta OTA
Stable

View details

Filename
3a824c050a26fa5c02f7ab89af1650de0d37e5b4.zip
File size
3.98 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
4f0066527b5783bd37242c457f7485c03a0f5869aa7ac813e09bad6b8b9b6334
SHA-1
73e03873d1fe80e6acc9bae3b4606a32128acaa8
Required starting builds
20C65, 20D47, 20D67
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)

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