FIRMWARE DETAILS

iOS 17.5.1

Build: 21F90May 20, 2024Full OTA

Stable

View details

Filename: ad7dcd43af5a7dea3dc04e1c62b50bcac13c2cc0.zip
File size: 6.50 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: e7f243958505da8ccb7989bfc6d071260107dcf728f88ed182ae1fa24f8dca79
SHA-1: f8c01697608b95c5c32e378d8e8edd2c332a93b2
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)

iPhone 15 Pro iPhone16,1

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