Apple has introduced a new update for users running the iOS 26.3 beta, identified as ‘iOS 26.3 (a)’. This update is designed for testing purposes only and does not include any security fixes. Users can find the update under the Privacy & Security section, specifically in Background Security Improvements, rather than the usual Software Update area.
The release notes clarify that this update is meant solely for testing the newly implemented Background Security Improvements system, which was part of the iOS 26.1 release last fall. All iPhones with iOS 26.1 and later have this system installed, although it has not yet been utilized by Apple.
Additionally, users have the option to remove the update directly from the Settings menu. If they choose to do so, their iPhone will restart and the update will be uninstalled. This testing phase may indicate that Apple is preparing to roll out Background Security Improvements to a wider audience in the near future.