Apple Inc has just rolled out the iOS 11.0.2 worldwide, but the latest update does not only come with bug fixes and tweaks under the hood. Apple has stopped signing iOS 10.3.3 and iOS 11.
Owners of 64-bit iPhone, iPad and iPod touch devices running on iOS 11.0.1 and iOS 11.0.2 can no longer downgrade their device's operating system to iOS 10.3.3 as Apple closed down their signing window. From iOS 10.3.3, 32-bit device owners are also not allowed to upgrade to iOS 11 for a similar reason.
The iOS 11 and its updates are compatible with 64-bit devices only, making the operating system of 32-bit devices on a dead end. This is part of Apple's crackdown on 32-bit software applications by requiring the developers to update their programs.
The iOS 11.0.2 update brings a few fixes including that of bad call quality on some iPhone 8 and iPhone 8 Plus models. Meanwhile, Apple is now testing the iOS 11.1 beta, which is expected to arrive in November as the launch OS of the iPhone X.
In the jailbreak community, no good news is coming out yet with regards to iOS 10.3.3 and iOS 11. The latest development was made in August courtesy of security research team KeenLab showing the iOS 10.3.2 and iOS 11 beta jailbreak demo to the public. The last public jailbreak was yalu102 for iOS 10.2 devices.