Apple iMac 24-inch (M1, Two Ports, 2021) macOS 11.5.1 firmware
Apple iMac 24-inch (M1, Two Ports, 2021)
Signed
macOS 11.5.1
Build 20G80 For iMac21,1, J456AP
Global · IPSW
A newer version is available for this region: macOS 27.0.1
Download
13.0 GB
Downloads from updates.cdn-apple.com.
File details
- OS
- macOS 11.5.1
- Region
- Global
- Type
- IPSW
- Install with
- How to restore a Mac with Apple silicon (IPSW)
- Released
- Size
- 13.0 GB
- File name
UniversalMac_11.5.1_20G80_Restore.ipsw- MD5
ca48d5c5ad8684e0a3e74639f900236a- SHA-1
c509056720fa190fda61c78b1b67ad42853228b5- SHA-256
fff098d7aef8c0003de27d889179f73e810db935c3cc60ba821367214f751ece
After downloading, compare the checksum with the one above. If they differ, the file is incomplete — download it again.
Before you download
- Make sure your device’s model number is one of: iMac21,1, J456AP. You will find it in Settings → About phone, or on the box.
- This file is for the Global region. Installing another region’s firmware can remove features or block updates.
- Apple devices can only restore versions marked “Signed”.
- Back up your photos, contacts and files first, and charge the battery above 50%.
How to install
Macs with Apple silicon (M1 and newer) and Intel Macs with a T2 chip can be restored from an IPSW using a second Mac and Apple Configurator. This reinstalls the firmware and macOS and erases the Mac.
Read the guide: How to restore a Mac with Apple silicon (IPSW)