How do I install macOS 15.3 beta on my iMac (24-inch, M3, 2023, Four Ports)?

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

What are SHSH blobs and how do I save them?

SHSH blobs are cryptographic tickets Apple uses to verify firmware installations. Saving them while a version is still signed lets you potentially restore to it later. Use TSS Saver (tsssaver.1conan.com) or the blobsaver app with your device ECID.

Home / Mac / iMac (24-inch, M3, 2023, Four Ports) / macOS 15.3 beta (24D5040f)

macOS 15.3 beta

Build 24D5040f

No Longer Signed

iMac (24-inch, M3, 2023, Four Ports) Mac15,5

Released

January 7, 2025

File Size

16.53 GB

Filename

UniversalMac_15.3_24D5040f_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 Type	macOS
Version	15.3 beta
Build ID	24D5040f
Release Date	January 7, 2025
Signing Status	Unsigned Status last checked March 10, 2026. Verify at IPSW.dev
Filename	UniversalMac_15.3_24D5040f_Restore.ipsw
File Size	16.53 GB
Download URL	https://updates.cdn-apple.com/2025WinterSeed/fullrestores/072-51416/CB0B4DD0-1512-47FF-91B8-862ECB6CD2CF/UniversalMac_15.3_24D5040f_Restore.ipsw

Installation Instructions

How to install this firmware

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

This version is not currently signed by Apple. Installation will fail unless you have saved SHSH blobs and are using futurerestore.

Other Versions for this Device

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