firmwarehub.
العربية
FIRMWARE DETAILS

iOS 17.3.1

Build: 21D61Feb 8, 2024Delta OTA
Stable

View details

Filename
7bac0c97ca32cb4f37b3da646e78416632a7a441.zip
File size
4.35 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
3ec778b6a92e3b22fd9768f162de5b53599dc67e60a696197e02930bd0e48c4b
SHA-1
eb53c09eb2421bc8ac3dba52bbef05c45c8dbf1d
Required starting builds
19F77, 19G71, 19G82
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