macOS 26.1 RC
Build 25B77
Currently Signed
MacBook Air (15-inch, M4, 2025)
Mac16,13
Released
October 28, 2025
File Size
18.72 GB
Filename
UniversalMac_26.1_25B77_Restore.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.
Beta Firmware Notice
For official public releases, visit IPSWDL.com
Firmware Details
| Device | MacBook Air (15-inch, M4, 2025) (Mac16,13) |
|---|---|
| OS Type | macOS |
| Version | 26.1 RC |
| Build ID | 25B77 |
| Release Date | October 28, 2025 |
| Signing Status |
Signed
Status last checked March 10, 2026.
Verify at IPSW.dev
|
| Filename | UniversalMac_26.1_25B77_Restore.ipsw |
| File Size | 18.72 GB |
| Download URL | https://updates.cdn-apple.com/2025FallFCS/fullrestores/082-71650/9F912A37-12E8-4AC7-9ABE-F12B1A38D1B1/UniversalMac_26.1_25B77_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.