How do I install macOS 26.3 beta 3 on my iMac (24-inch, M4, 2024, Two 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.

Is macOS 26.3 beta 3 still signed by Apple?

Yes, this firmware is currently being signed by Apple and can be installed normally.

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, M4, 2024, Two Ports) / macOS 26.3 beta 3 (25D5112c)

macOS 26.3 beta 3

Build 25D5112c

Currently Signed

iMac (24-inch, M4, 2024, Two Ports) Mac16,2

Released

January 26, 2026

File Size

18.87 GB

Filename

UniversalMac_26.3_25D5112c_Restore.ipsw

Download IPSW

Important Notice About Signing Status

Signing status was last updated 4 hours 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, M4, 2024, Two Ports) (Mac16,2)
OS Type	macOS
Version	26.3 beta 3
Build ID	25D5112c
Release Date	January 26, 2026
Signing Status	Signed Status last checked March 12, 2026. Verify at IPSW.dev
Filename	UniversalMac_26.3_25D5112c_Restore.ipsw
File Size	18.87 GB
Download URL	https://updates.cdn-apple.com/2026WinterSeed/fullrestores/047-27561/D17A405D-58FC-4CD3-9CBD-2FF572E5B45C/UniversalMac_26.3_25D5112c_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.

Other Versions for this Device

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Back to Device View on Official Site Back Home

macOS 26.3 beta 3

Important Notice About Signing Status

Beta Firmware Notice

Firmware Details

Installation Instructions

How to install this firmware

Release Notes

SHSH Blobs

What are SHSH Blobs?

Using TSS Saver:

Using blobsaver:

Other Versions for this Device