Mac Frozen After macOS 26.4 Update? Here's How to Recover It

If your Apple silicon Mac (M1, M2, M3, or M4) has gone unresponsive after attempting a macOS 26.4 update — no power, dark screen, dead trackpad, but the Caps Lock key glowing — you are not alone. Apple has confirmed this is a software issue currently under investigation. The good news: it is fixable, no hardware repair is needed, and you have not bricked your Mac.

What's Actually Happening

Apple silicon Macs that try to install macOS 26.4 can end up frozen in DFU mode (Device Firmware Update mode) — a recovery state normally used to restore the operating system at the firmware level. Once the Mac drops into DFU mode it cannot boot or be woken normally, which makes it look completely dead. Apple's support documentation, last updated 2 May 2026, classifies this as a software issue and confirms a fix is available without sending the device away for hardware service.

The issue affects Macs with Apple silicon specifically. Older Intel-based Macs use a different update path and are not affected by this particular bug.

How to Tell If Your Mac Is Affected

The symptoms are consistent and easy to spot:

• Mac appears to have no power — the screen stays black even when you press the power button.
• Trackpad is unresponsive — no click, no haptic feedback, nothing.
• Caps Lock key is illuminated — the green LED on the Caps Lock stays lit even though the Mac otherwise appears off. This is the giveaway: a fully off Mac will not light up Caps Lock.
• It happened during or right after a macOS 26.4 update attempt — the failure is tied to the update process, not random.

If your Mac has the Caps Lock light on but everything else is dead, you are looking at the DFU-mode freeze, not a hardware failure. That is the case Apple's downgrade procedure resolves.

The Official Fix: Downgrade to macOS 26.3.1

Apple's recommended recovery is to use Apple Configurator 2 (build 117250 or later) on a second Mac to revive the affected machine and roll it back to macOS 26.3.1. Here is the procedure:

1. Download the macOS 26.3.1 IPSW file from Apple's developer downloads or support article.
2. Put the affected Mac into DFU mode (most M-series Macs are likely already there) and connect it to a host Mac using a USB-C cable.
3. Open Apple Configurator 2 on the host Mac. The host needs Apple Configurator 2 build 117250 or later — older versions will not work.
4. Use the Revive option with the downloaded IPSW. Configurator will reflash the firmware. If Revive fails or the issue persists, run the Restore option instead — this wipes the affected Mac and reinstalls a clean macOS 26.3.1.
5. Verify the Mac boots normally and run through the initial setup.
6. Update to the latest version of macOS through System Settings > General > Software Update — but watch for guidance on whether 26.4 has been re-released as a stable version before retrying.

Two things matter here: you need a second Mac running Apple Configurator 2, and you need a working USB-C cable that supports data (not all charging cables do). If you have a Time Machine backup, the Revive path keeps your data intact. If you have to fall back to Restore, your data will be wiped — recoverable only from backup.

When to Bring It to iRepair Instead

Most people will not have a spare Mac, the right cable, the IPSW download, and a current copy of Apple Configurator 2 sitting around. That is when it is worth dropping it into a professional. iRepair at 391 Rosebank Road, Avondale, has the host Mac, the cables, and the experience to run the Configurator revive procedure cleanly — usually same-day for customers who walk in.

Other reasons to bring it in rather than DIY:

• You have unbacked-up data on the affected Mac. We always attempt the data-preserving Revive procedure first, and if that fails we have data recovery tools that can pull files from the SSD before any wipe.
• You are unsure whether it is the DFU bug or something else. A swollen battery, failed display assembly, or logic board issue can present similar symptoms — see our guides on swollen laptop batteries and MacBook display problems for related failure modes. We diagnose first, fix second.
• You are anywhere in Auckland — Avondale, New Lynn, Mt Albert, Henderson, Waterview, Blockhouse Bay, or further afield. Our free nationwide courier service means you can post your Mac in and have it returned recovered.

iRepair is an Apple Independent Repair Provider with direct access to genuine Apple parts and proprietary repair tools. Software-only recoveries like this one preserve your full Apple warranty.

How to Avoid This Next Time

Until Apple ships a fix and re-releases macOS 26.4 (or supersedes it), the safest play is to hold off on installing 26.4 if you have not already. A few practical habits help:

• Wait a week after any macOS major release before updating. Issues like this one usually surface within the first few days as more users hit the bug.
• Keep a current Time Machine backup — if you have to Restore (not just Revive), your data is only as recent as your last backup. External SSDs are cheap; the data loss is not.
• Make sure you have at least 50% battery and a stable power connection during any macOS update. Update interruptions are a common DFU-failure trigger.
• Disable automatic macOS installs in System Settings > General > Software Update > Automatic Updates if you want full control over when updates apply.