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FIRMWARE DETAILS

iOS 17.3.1

Build: 21D61Feb 8, 2024Delta OTA
Stable

View details

Filename
3c587386f31e656fcc0a0e3925417e302896f669.zip
File size
4.46 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
8dababa1362e05099aed88cb2f5047e78844c36ec47ca6067adffeffb0d1d5ca
SHA-1
36ceee03d9a734e5e05f8cee1eda20b425ecf4ce
Required starting builds
19E241, 19E258
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