About This Firmware
macOS 15.6.1
(build 24G90) is an official Apple IPSW
for the Mac mini (M1, Late 2020),
released on 2025-08-20.
The file is served directly from Apple's CDN.
This firmware is currently signed by Apple, so it can be used to restore or update your device via iTunes or Finder.
Verify the download using the checksums below.
Filename
UniversalMac_15.6.1_24G90_Restore.ipsw
Checksums
SHA-256
3d87686b691ac765eb6a6b3082b2334e2af9710096a00432dd519af89ff2ea78
SHA-1
a19ba56bb931769580060647a466c5b2d09da761
MD5
2c22273091d69ea84723a1f2d36332f3
Direct URL
https://updates.cdn-apple.com/2025SummerFCS/fullrestores/093-10809/CFD6DD38-DAF0-40DA-854F-31AAD1294C6F/UniversalMac_15.6.1_24G90_Restore.ipsw
Other Devices
Mac mini (M2 Pro, 2023)
Mac14,12
MacBook Air (15-inch, M2, 2023)
Mac14,15
MacBook Pro (M2 Max, 16-inch, 2023)
Mac14,6
MacBook Pro (M2 Pro, 16-inch, 2023)
Mac14,10
Mac Pro (2023)
Mac14,8
iMac (Two Ports, 24-inch, 2023)
Mac15,4
How to Restore with This IPSW
iTunes / Finder
macOS & Windows- Download the .ipsw file to your computer.
- Connect your Mac mini (M1, Late 2020) via USB.
- Open iTunes (Windows / macOS Mojave and earlier) or Finder (macOS Catalina+) and select your device.
- Update (keep data): hold Option (Mac) or Shift (Windows) and click Update, then pick the .ipsw file.
- Restore (erase & install): hold Option / Shift and click Restore iPhone…, then pick the .ipsw file.
- Wait for the process to finish - do not disconnect.
Restoring will erase all data on the device. Back up first.
3uTools
Windows- Download and install 3uTools from 3u.com.
- Connect your Mac mini (M1, Late 2020) via USB and trust the computer on the device.
- Go to Flash & JB > Easy Flash.
- Click Import and select the downloaded .ipsw file.
- Choose Flash mode: Update keeps data, Restore wipes the device.
- Click Flash and wait for the progress bar to complete - do not disconnect.
Only flash firmware that matches your exact device model.
DFU Mode
Recovery tipIf your device is stuck in a boot loop or iTunes/Finder does not recognise it, enter DFU mode first, then select the .ipsw file as normal.
iPhone 8 / X and later
- Quickly press & release Volume Up
- Quickly press & release Volume Down
- Hold Side button until screen goes black
- Hold Side + Volume Down for 5 s
- Release Side, hold Volume Down 5 more s
- Black screen = DFU active
iPhone 7 / 7 Plus
- Hold Sleep/Wake + Volume Down for 8 s
- Release Sleep/Wake, keep holding Volume Down for 5 s
- Black screen = DFU active
iPhone 6s and earlier
- Hold Sleep/Wake + Home for 8 s
- Release Sleep/Wake, keep holding Home for 5 s
- Black screen = DFU active