MacBook Air (15-inch, M4, 2025)

macOS 27.2.1 (26B131) for MacBook Air (15-inch, M4, 2025)

Signed — can be installed Released Nov 9, 2026 Mac16,13

Download IPSW

UniversalMac_27.2.1_26B131_Restore.ipsw

23.84 GB
Download macOS 27.2.1

The file is downloaded directly from Apple’s servers (updates.cdn-apple.com). Large files download faster with a download manager or curl -O.

Verify the file

SHA256
233e85a09887579d47d0b195e7db72be7f204261059c6946f719acf6b300814f
SHA1
834e8fd6d68520b2cabf0dc66cea28c2fc1462df
MD5
694c21aa50e05315cdb43271cdbf5e37

On a Mac: shasum -a 256 UniversalMac_27.2.1_26B131_Restore.ipsw · On Windows: certutil -hashfile UniversalMac_27.2.1_26B131_Restore.ipsw SHA256

Firmware details

Version
macOS 27.2.1
Build
26B131
Released
November 9, 2026
Uploaded
November 6, 2026
File size
23.84 GB (25,595,954,706 bytes)
Signing
Signed

Device

Identifier
Mac16,13
Board
J715AP
Platform
t8132
CPID
0x8132
BDID
0x2E

How to install macOS 27.2.1 with this IPSW

  1. Back up your MacBook Air (15-inch, M4, 2025) to iCloud or your computer — restoring erases the device.
  2. Turn off Find My in Settings → [your name] → Find My.
  3. Connect the device with a cable and open Finder (macOS Catalina or later) or Apple Devices / iTunes (Windows).
  4. Hold Option (Mac) or Shift (Windows) and click Restore. Choose UniversalMac_27.2.1_26B131_Restore.ipsw.
  5. Wait — the device restarts several times. Don’t disconnect it until you see the Hello screen.

Stuck on the Apple logo? Put the device into recovery mode first, then restore.

Build 26B131 is also available for

Mac mini (M6) Mac Studio (M5 Max) Mac Studio (M5 Ultra) Mac mini (M5 Pro) MacBook Pro (16-inch, M5 Pro) MacBook Pro (14-inch, M5 Pro) MacBook Air (15-inch, M5) MacBook Pro (16-inch, M5 Max) MacBook Air (13-inch, M5) MacBook Pro (14-inch, M5 Max) MacBook Neo MacBook Pro (14-inch, M5) Mac Studio (2025) MacBook Air (13-inch, M4, 2025) Mac Studio (2025) MacBook Pro (M4 Pro, 14-inch, Nov 2024) iMac (Two Ports, 24-inch, 2024) MacBook Pro (M4 Pro, 16-inch, Nov 2024) Mac mini (M4 Pro, 2024) iMac (Four Ports, 24-inch, 2024) MacBook Pro (M4 Max, 16-inch, Nov 2024) MacBook Pro (M4, 14-inch, Nov 2024) MacBook Pro (M4 Max, 14-inch, Nov 2024) Mac mini (M4, 2024) MacBook Air (13-inch, M3, 2024) MacBook Air (15-inch, M3, 2024) MacBook Pro (M3 Pro, 16-inch, Nov 2023) MacBook Pro (M3 Max, 14-inch, Nov 2023) MacBook Pro (M3 Max, 14-inch, Nov 2023) MacBook Pro (M3, 14-inch, Nov 2023) MacBook Pro (M3 Max, 16-inch, Nov 2023) MacBook Pro (M3 Pro, 14-inch, Nov 2023) iMac (Four Ports, 24-inch, 2023) iMac (Two Ports, 24-inch, 2023) MacBook Pro (M3 Max, 16-inch, Nov 2023) Mac Pro (2023) Mac Studio (M2 Ultra, 2023) Mac Studio (M2 Max, 2023) MacBook Air (15-inch, M2, 2023) MacBook Pro (M2 Pro, 16-inch, 2023)

← All MacBook Air (15-inch, M4, 2025) firmware