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Why are iPhone users skipping iOS 26 for the iOS 18.7.3 legacy update?
Apple has deployed iOS 18.7.3 and iPadOS 18.7.3. These updates target users who deliberately choose to remain on the iOS 18 architecture rather than migrating to the newer iOS 26 environment. This release focuses strictly on security patches. It contains no new features. It serves as a critical bridge for maintaining device integrity without adopting the radical changes introduced in the latest major operating system.
This launch occurs simultaneously with the rollout of Apple’s next-generation software suite, including iOS 26.2, macOS Tahoe 26.2, and MacOS Sequoia 15.7.3. Consequently, users must navigate the update process carefully to ensure they install the correct version.
Device Compatibility
The iOS 18.7.3 patch is compatible with devices that support iOS 18 but have not yet upgraded to iOS 26. If you have already installed iOS 26, you cannot install this patch.
Supported Hardware:
- iPhone: iPhone XS and newer models.
- iPad Pro: 13-inch, 12.9-inch (3rd gen+), 11-inch (1st gen+).
- iPad Air: 3rd generation and newer.
- iPad: 7th generation and newer.
- iPad mini: 5th generation and newer.
Critical Installation Procedure
Apple prioritizes the adoption of its latest software, iOS 26. Therefore, the “Software Update” menu often highlights the major upgrade over the legacy security patch. To stay on iOS 18, follow these steps precisely:
- Secure Your Data: Initiate a full iCloud or local backup before beginning.
- Access Settings: Navigate to Settings > General > Software Update.
- Bypass the Banner: You will likely see a prominent prompt to “Upgrade to iOS 26.” Ignore this.
- Locate the Patch: Scroll to the bottom of the screen. Look for the option labeled “Also Available” or explicitly listed as iOS 18.7.3.
- Execute Update: Select the 18.7.3 option to download and install.
Strategic Advisory: Why Users Are Avoiding iOS 26
Many users are declining the upgrade to iOS 26 due to specific usability concerns. The introduction of the “Liquid Glass” interface has caused legibility issues for some demographics. Additionally, the significant redesign of core utilities like Photos and Phone has alienated users who prefer the traditional workflow of iOS 18.
Important Recommendation
If you intend to remain on iOS 18 permanently, disable Automatic Updates. Apple aggressively pushes the iOS 26 installer. Disabling automatic updates prevents your device from upgrading overnight without your explicit consent.
Technical Limitations and IPSW Firmware
Apple has restricted the availability of IPSW firmware files for iOS 18.7.3. These files are typically used for manual restorations. The limited release suggests Apple is actively preventing users who have already upgraded to iOS 26 from downgrading back to iOS 18.
Current confirmed IPSW availability:
- iPhone XS
- iPhone XS Max
- iPhone XR
Release Notes Summary
The official documentation for iOS 18.7.3 is brief. It emphasizes that this update “provides important security updates and is recommended for all users.” It does not introduce functional changes. For detailed breakdowns of the Common Vulnerabilities and Exposures (CVEs) addressed in this patch, professionals should consult Apple’s security support page.