iMac 24-inch (M1, Four Ports, 2021) iMac21,2

IPSW Signed 20G165

macOS 11.6

macOS

Version

11.6

Build ID

20G165

File Size

13.00 GB

Release Date

2021-09-17

Last Updated

2021-09-10

Download IPSW

Beta firmware? Download Here →

About This Firmware

macOS 11.6 (build 20G165) is an official Apple IPSW for the iMac 24-inch (M1, Four Ports, 2021), released on 2021-09-17. 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 SHA-256 or SHA-1 checksum listed in the Checksums section below.

Filename

UniversalMac_11.6_20G165_Restore.ipsw

Checksums

SHA-256 9bc6b9e0d42bb892ee139a8d88fc5e8ce2931d57743d8e3ed1ce45aa5da8add6

SHA-1 a66fb4f527006b776a0ad2d435fe433367b551b1

MD5 dfee5d894ef02999dbd1a0214f232b9d

Direct URL

https://updates.cdn-apple.com/2021FallFCS/fullrestores/071-97388/C361BF5E-0E01-47E5-8D30-5990BC3C9E29/UniversalMac_11.6_20G165_Restore.ipsw

Other Devices

iPhone 8 Plus (Global)

iPhone 4 (GSM / 2012)

iPhone3,2

iPhone 16 Pro

iPhone17,1

How to Restore with This IPSW

iTunes / Finder

macOS & Windows

Download the .ipsw file to your computer.
Connect your iMac 24-inch (M1, Four Ports, 2021) 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 iMac 24-inch (M1, Four Ports, 2021) 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 tip

If 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