FIRMWARE DETAILS

iOS 15.1

Build: 19B74Oct 25, 2021Restore IPSW

Stable

View details

Filename: iPhone13,4_15.1_19B74_Restore.ipsw
File size: 6.63 GB
File type: Restore IPSW
Download host: updates.cdn-apple.com
Link availability: Not verified
Source did not report availability
Last link check: Not checked
SHA-256: 4be85b0647734c3dbf7d4eba63a4726aac6cfd4075526b1a3ae871b0d06cff02
SHA-1: 29f0436d777732c2d91fed60c8ac972674520dd7
Required starting builds: Not reported
Board restrictions: Not reported

Compatible hardware (1)

iPhone 12 Pro Max iPhone13,4IPSW.me public API retrieval · Oct 22, 2026, 12:42 AM UTC

Unsigned

Signing is specific to the device and file. A signed build does not guarantee a downgrade or successful installation.

Source provenance

IPSW.mehttps://api.ipsw.me/v4/device/iPhone13%2C4?type=ipsw ↗

Public API; no blanket open-data license established
Last imported: Oct 19, 2026, 6:20 PM UTC
Record fingerprint: b1f24c5a7b517dbab084957b50cc035a