What is accessoryupdaterd on Mac?

Last updated: 2026-07-31

What it is

accessoryupdaterd is an Apple-built, system-level firmware update daemon managed by launchd. It belongs to the private MobileAccessoryUpdater framework. Its job is to check for, download, prepare, and install firmware for hardware supported by the updater components present on a Mac.

The updater plugins examined during research identify AirPods, some Beats products, Magic Keyboard, Magic Mouse, Magic Trackpad, some built-in trackpads, Apple displays, and several kinds of USB-C, Thunderbolt, and Lightning accessories. That list should not be read as a permanent or complete Apple support promise. The installed plugins can change with the Mac model and macOS release, and the presence of supporting code does not guarantee that every plugin is active on every Mac.

The verified system executable is located at /System/Library/PrivateFrameworks/MobileAccessoryUpdater.framework/Support/accessoryupdaterd, with the Apple code identifier com.apple.accessoryupdaterd. Those details matter when identifying the process: another executable using the same name from a different path is not automatically the protected Apple copy.

Why it talks to the network

accessoryupdaterd may make a network connection when a supported accessory is detected, connected, or paired. A plugin can also perform a periodic update check, and another system component can request an update operation. None of these triggers means that firmware will necessarily be downloaded every time.

For update data, accessoryupdaterd uses Apple’s MobileAsset and software-update infrastructure. It can retrieve firmware catalogs, metadata, and the firmware resources themselves. Some firmware may also require authorization from Apple signing or personalization services. Apple has not published a complete list of servers used by this process, so claims about a fixed set of domains or endpoints remain unverified.

The conditions for installing an update depend on the device. Apple says AirPods normally need to be charging and within Bluetooth range of an internet-connected Mac. Rechargeable Magic Keyboard, Magic Mouse, and Magic Trackpad devices should be connected to the Mac for charging during an update, while the Mac remains idle without going to sleep. These conditions do not form one universal rule for every accessory.

After a firmware resource has been downloaded, the actual write to the device is local. Depending on the accessory, the transfer can use Bluetooth, USB, Thunderbolt, or the relevant accessory protocol.

How much traffic is normal

There is no reliable universal number for normal accessoryupdaterd traffic. Apple has not published a process-wide baseline, maximum, or dependable per-device traffic range, so assigning a specific number of megabytes would be guesswork.

When no update is needed, accessoryupdaterd can remain idle without downloading anything. An update check will usually involve only a short exchange of catalog or metadata information. If new firmware is found, a temporary download burst comparable to the firmware resource can follow. This pattern is occasional and task-driven, not continuous streaming traffic.

Repeated, sustained high usage is therefore worth investigating, but the process name alone cannot explain it. Check which accessories were connected, when the traffic occurred, the destination information available to you, and relevant system logs. Those details help distinguish an expected firmware operation from repeated checks, retries, or activity requiring further examination.

Can you turn it off

The practical recommendation is to keep accessoryupdaterd available. Apple does not provide a System Settings path or a dedicated switch for turning off the entire service.

Blocking, deleting, or forcibly disabling accessoryupdaterd can cause firmware checks, downloads, or installations to fail or remain delayed. That may leave supported accessories without security fixes, reliability improvements, or compatibility updates. Terminating the process is not necessarily permanent either, because launchd may start it again when matching hardware appears or another update request arrives.

The option for installing system data files and security updates is not a master switch for accessoryupdaterd. Apple requires that option for receiving some Magic input-device firmware, but it also controls broader system security content. Turning it off does not establish that accessoryupdaterd will stop running.

What people get wrong

1. “accessoryupdaterd only updates AirPods, and it runs only while they are charging.” The installed updater plugins cover more than AirPods. They also identify some Beats products, Magic input devices, built-in trackpads, displays, and USB-C, Thunderbolt, and Lightning accessories. Charging, connection, and idle-time requirements vary by device.

2. “accessoryupdaterd is the general firmware updater for every HomeKit accessory.” There is no evidence for that claim. Apple’s Matter OTA documentation assigns the Matter OTA Provider role to an Apple TV or HomePod-class primary home hub. The exact responsibility of Mac-based accessoryupdaterd for ordinary HomeKit or Matter accessories remains unverified.

3. “accessoryupdaterd is always downloading in the background.” Its launchd service uses Adaptive and Pressured Exit behavior, allowing it to leave memory when no work remains. Hardware-matching events, periodic checks, or XPC requests can wake it again. Seeing it return does not prove a continuous download.

4. “Disabling accessoryupdaterd only means losing a few new features.” Firmware updates can include security fixes. Apple has published a Magic Keyboard firmware update that addressed a vulnerability capable of exposing a Bluetooth pairing key and allowing traffic monitoring.

5. “Killing accessoryupdaterd, permanently disabling it with launchctl, or deleting its files is a harmless optimization.” It is a protected Apple system daemon. Such changes can break accessory firmware updates, and launchd may restart the process after it is terminated.

6. “The automatic-update option in System Settings is the master switch for accessoryupdaterd.” It is not. One related setting is required for some Magic input-device firmware, but that setting covers broader system security content and does not guarantee that disabling it stops this daemon.

7. “Anything named accessoryupdaterd must be Apple’s original process.” A name is not enough. The verified Apple copy has a protected framework path and the identifier com.apple.accessoryupdaterd; a same-named executable elsewhere needs an independent signature check.

Seeing what it actually used

To determine what happened on your Mac, check accessoryupdaterd in Bytetally’s per-process traffic statistics and note the time window in which an accessory was connected or paired. Compare brief metadata activity with any later download burst, then correlate unusual repeated traffic with the connected device and system logs. This gives you evidence from your own Mac without inventing a universal traffic threshold.

Related processes

Common questions