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FIRMWARE DETAILS

iOS 17.3.1

Build: 21D61Feb 8, 2024Delta OTA
Stable

View details

Filename
bd616c242433430f8a5586c76c5672a774a45c01.zip
File size
4.43 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
920ecb8a4326cea6fd498e3bfe1f8b4884fcf069a429781039bbbfb789ed1485
SHA-1
34b78653df82b7760c21f6bcf5af7f0fed8b6ede
Required starting builds
19A340, 19A344, 19A346, 19A348, 19A404
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