Home / Mac / iMac (24-inch, M3, 2023, Four Ports) / macOS 26.1 beta (25B5042k)
Device

macOS 26.1 beta

Build 25B5042k
Currently Signed
iMac (24-inch, M3, 2023, Four Ports) Mac15,5
Released
September 22, 2025
File Size
19.01 GB
Filename
UniversalMac_26.1_25B5042k_Restore.ipsw
Download IPSW

Important Notice About Signing Status

Signing status was last updated less than a minute ago. Apple can stop signing at any time without notice.

Verify current status at IPSW.dev

Beta Firmware Notice

For official public releases, visit IPSWDL.com

Firmware Details

Device iMac (24-inch, M3, 2023, Four Ports) (Mac15,5)
OS TypemacOS
Version26.1 beta
Build ID25B5042k
Release DateSeptember 22, 2025
Signing Status Signed
Status last checked March 10, 2026. Verify at IPSW.dev
Filename UniversalMac_26.1_25B5042k_Restore.ipsw
File Size19.01 GB
Download URL https://updates.cdn-apple.com/2025FallSeed/fullrestores/082-91406/9745D030-E51F-497A-9E26-1B40A07FE9AE/UniversalMac_26.1_25B5042k_Restore.ipsw

Installation Instructions

How to install this firmware

  1. Download the IPSW file.
  2. Connect your device to your computer.
  3. Open iTunes (Windows / macOS Mojave and earlier) or Finder (macOS Catalina and later).
  4. Hold Option (⌥) on Mac or Shift on Windows and click Check for Update or Restore.
  5. Select the downloaded IPSW file and follow on-screen instructions.

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