How do I install macOS 26.3 beta on my MacBook Pro (14-inch, M1 Pro, 2021)?

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 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 / MacBook Pro (14-inch, M1 Pro, 2021) / macOS 26.3 beta (25D5087f)

macOS 26.3 beta

Build 25D5087f

Currently Signed

MacBook Pro (14-inch, M1 Pro, 2021) MacBookPro18,3

Released

December 15, 2025

File Size

18.79 GB

Filename

UniversalMac_26.3_25D5087f_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	MacBook Pro (14-inch, M1 Pro, 2021) (MacBookPro18,3)
OS Type	macOS
Version	26.3 beta
Build ID	25D5087f
Release Date	December 15, 2025
Signing Status	Signed Status last checked March 10, 2026. Verify at IPSW.dev
Filename	UniversalMac_26.3_25D5087f_Restore.ipsw
File Size	18.79 GB
Download URL	https://updates.cdn-apple.com/2025FallSeed/fullrestores/089-61648/B3DA1DA6-F227-4898-87F1-D6F07AEDC708/UniversalMac_26.3_25D5087f_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

View All

Back to Device View on Official Site Back Home

macOS 26.3 beta

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