On the morning of September 30, Apple officially released the iOS 18.7.1 update for iPhone users. This update is primarily designed to deliver critical security patches and is strongly recommended for all users still operating on iOS 18. Compatible with iPhone models ranging from the iPhone XS up to the iPhone 16 series, this update allows firmware downgrades via computer only for the iPhone XS, XS Max, and XR models.

The focus of this update is on bolstering system security, specifically addressing vulnerabilities associated with FontParser and resolving the 'out-of-bounds write' issue. Serving as what could be considered the 'final' security-focused update for the iOS 18 series, it is entirely dedicated to implementing security patches. It is important to note that users of iPhone models from the 11 series through to the 16 series are unable to downgrade from higher iOS versions. Apple strongly advises all users to install this update, thereby ensuring robust security measures for those who choose not to upgrade to the latest major system versions.