Users who have installed iOS 9 now have a second patch to address previous issues.
Similar to updating to iOS 9.0.1, users can upgrade to iOS 9.0.2 for iPhone and iPad via OTA protocol using the following steps:
Navigate to Settings => General => Software Update
Select Download and Install
Agree to the following Terms & Conditions then wait for the iOS 9.0.2 version to download successfully.
Due to its relatively small size, users only need to spend a short amount of time to successfully update their devices to iOS 9.0.2.
Alongside the release of iOS 9.0.2, Apple has officially ceased support for users downgrading from iOS 9 to iOS 8.4 or 9.0. Therefore, users should avoid encountering errors by refraining from intentionally downgrading iOS on their devices.