FIRMWARE DETAILS

iOS 17.5.1

Build: 21F90May 20, 2024Full OTA

Stable

View details

Filename: f69b10af623f199e4044d13e83ee5378dbd0b8c4.zip
File size: 5.79 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: 3081b1554389c015672f5cc059c9212e6fa82e9c497b890e24392ca87f2a3470
SHA-1: b69f60b1d7f5d99027b1cabc4bb59794787d1e6f
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 SE (2nd generation) iPhone12,8

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