Apple iMac 24-inch (M1, Two Ports, 2021) macOS 27.0.1 firmware

Apple iMac 24-inch (M1, Two Ports, 2021) Signed

macOS 27.0.1

Build 26A434 For iMac21,1, J456AP

Global · IPSW

Download 24.8 GB

Downloads from updates.cdn-apple.com.

File details

Device: Apple iMac 24-inch (M1, Two Ports, 2021)
OS: macOS 27.0.1
Region: Global
Type: IPSW
Install with: How to restore a Mac with Apple silicon (IPSW)
Released: 28 Sep 2026
Size: 24.8 GB
File name: UniversalMac_27.0.1_26A434_Restore.ipsw
MD5: 4b8c55bbeefa2aebe3a112f89822ecc4
SHA-1: 7e020710acade1911309aa73901ed5a92790bafc
SHA-256: 2f016638293c3e641b8b25391a76fbc16563b3711915a5551cf8aa0f5598a5c1

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)

Other Apple iMac 24-inch (M1, Two Ports, 2021) versions

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