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FIRMWARE DETAILS

iOS 17.5.1

Build: 21F90May 20, 2024Full OTA
Stable

View details

Filename
2a38cedcc05e9c0b1bcf3fcd1b3ec086091273d7.zip
File size
6.23 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
3d0fd65662f4ab77cf700a01cabbfcf234f8e65237b011cd6630657ee5d98ef2
SHA-1
e79bd520fb9f7fef5dc7d9be42bac006eded745b
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 (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%3B21F90.json ↗

MIT — copyright 2022 emiyl
Last imported: Oct 19, 2026, 6:28 PM UTC
Record fingerprint: 1ae039bd01274135bfccfb7ce06a0234