Rumor

New iPhone 18 Pro Models Will Have Day One Update

MacRumors • Thu, 17 Sep 2026

Customers receiving an iPhone 18 Pro , &zwnj;iPhone 18 Pro&zwnj; Max, an Apple Watch Series 12, or an Apple Watch Ultra 4 tomorrow will need to install a software update right away. The &zwnj;iPhone 18 Pro&zwnj; and &zwnj;iPhone 18 Pro&zwnj; Max ship with iOS 27 variants with a 24A427 or 24A8428 version number. The launch version of &zwnj;iOS 27&zwnj; is version 24A437, so if you're getting an &zwnj;iPhone 18 Pro&zwnj;, expect a software update during the setup process. The Apple Watch Series 12 and the &zwnj;Apple Watch Ultra 4&zwnj; have watchOS 27 with a version number of 24R359, but the launch version of &zwnj;watchOS 27&zwnj; is 24R364. We're also expecting the AirPods 5 to have a day one firmware update, though that will happen over the air. Apple recently released 9A350 AirPods firmware to add support for &zwnj;iOS 27&zwnj; features. All of the new products are set to launch on Friday, September 18. Related Roundup: iPhone 18 Pro Buyer's Guide: iPhone 18 Pro (Buy Now) Related Forum: iPhone This article, " New iPhone 18 Pro Models Will Have Day One Update " first appeared on MacRumors.com Discuss this article in our forums

What happened?

Story details

Customers receiving an iPhone 18 Pro , &zwnj;iPhone 18 Pro&zwnj; Max, an Apple Watch Series 12, or an Apple Watch Ultra 4 tomorrow will need to install a software update right away.

The &zwnj;iPhone 18 Pro&zwnj; and &zwnj;iPhone 18 Pro&zwnj; Max ship with iOS 27 variants with a 24A427 or 24A8428 version number.

The launch version of &zwnj;iOS 27&zwnj; is version 24A437, so if you're getting an &zwnj;iPhone 18 Pro&zwnj;, expect a software update during the setup process.

Why it matters

This page keeps Apple rumors separate from official updates, so readers can follow early reports without confusing them with confirmed announcements.

Original source

https://www.macrumors.com/2026/09/17/iphone-18-pro-day-one-update/

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