The crackling noise was generally believed to be a unique software issue rather than a hardware problem. Apple reported on September 27 that the issue was being investigated, and that the company would issue a fix in a future update.
iOS 11.0.2 Also Fixes:
An issue that could cause some photos to be hidden.
An issue where attachments in S/MIME encrypted emails would not open.
iOS 11.0.2 also includes security patches that Apple does not disclose to the public.
Beyond the most recent update, iOS 11 adds a revamped Control Center with customizable shortcuts and a new Lock screen that’s been merged with the Notification Center. The next-gen software also adds several upgrades to Siri, including a completely new voice that is much more natural-sounding. Additionally, iOS 11 will introduce a real-time translation feature and other hefty upgrades to the digital assistant. It also marks the general release of ARKit, meaning that iOS 11 is now the largest augmented reality platform in the world. Other additions include a slew of updates to native apps, a Do Not Disturb While Driving mode, and built-in screen recording.
How to Download iOS 11.0.2
iOS 11.0.2 is available to download on devices including the iPhone 5s and later, iPad Air and later, and iPod touch 6th generation.