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FIRMWARE DETAILS

iOS 17.5.1

Build: 21F90May 20, 2024Full OTA
Stable

View details

Filename
506d150439f99db09a8e0d7c173147098239c361.zip
File size
6.51 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
5c4be71a57396547b925f3e36ba843686cf011215b3cade677e40901889150c6
SHA-1
5754cdbf36b8bfac4c10c3a540857b0e4dad0572
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