The iPhone 18 Pro, iPhone 18 Pro Max, Apple Watch Series 12, and Apple Watch Ultra 4 are all due to be released on Friday, September 18. However, buyers should brace for immediate updates — every device ships with an earlier version of its operating system than what will be required out of the box.
Both new iPhone Pro models arrive with variants of iOS 27 labeled either 24A427 or 24A8428. The official launch build, however, is version 24A437. That means setup will include installing the fresh iOS 27 build as soon as a device is turned on.
Likewise, the new Apple Watch models come preloaded with watchOS 27 build 24R359, while 24R364 is the version that will be made available at launch. Upgrading the OS right away will be necessary for proper functionality.
AirPods Also Worth Noting
The fifth-generation AirPods, expected to accompany the iPhone and Watch launches, are set for a firmware update on day one. Apple pushed firmware build 9A350 ahead of the launch to bring support for specific iOS 27 features.
These updates are anticipated to arrive via over-the-air patching — there’s no separate installer. Users will need WiFi or cellular data to download and apply them during initial setup or shortly afterward.
Why It Happens
This isn’t unusual. Apple often builds devices with software versions that are finalized just before mass production, and then finalizes the OS during QA or shipping. As a result, preloaded OS builds lag slightly behind what’s ready for public release.
It ensures late-stage fixes — for security, stability, or compatibility with new hardware — make it into users’ hands right at launch. But it also means early adopters must perform these updates immediately to get the latest build.
What to Do: When unboxing your device, allow some time for setup. Make sure you have reliable internet; accept whatever the prompt is for the OS update before proceeding.
Even with updates, other adjustments may follow in the coming weeks — Apple often irons out bugs post-release, especially after new hardware launches. But expect the official builds to be stable enough for normal use.
These first-day updates reflect Apple’s push to ensure new devices ship close to final software perfection. Still, they also underscore the value of downloading the latest patches right away — skipping them can leave new hardware running software that’s behind in performance or support. Devices like the iPhone 18 Pro and Watch Ultra 4 may feel new, but they begin life one update behind.
