Users of Apple devices that run the latest version of iOS — the iOS 9.1 — have complained of a Touch ID sensor issue, and there seem to be no immediate solution available at the moment.

A bug in iOS 9.1 seems to have caused the problem with the Touch ID sensor, as several users of Apple devices, especially iPhone 6, iPhone 6 Plus and iPhone 5s, have been facing issues in Touch ID fingerprint recognition and even complete failure to activate.

The problem started when Apple rolled out the iOS 9.1 update to eligible devices two weeks ago. The company optimised the Touch ID software in the new version to improve user experience of the iPhone 6s and iPhone 6s Plus, but it seems to have caused problems in older iPhones.

Apple is mum on the issue, and people on Apple's support communities forum claimed the Touch ID sensor issue recurs even after resetting the device. Adding to the woes, Apple has stopped signing iOS 9.0.2, which means iPhone users who have upgraded to iOS 9.1 can't downgrade to the older version.

So, when is Apple expected to solve the iOS 9.1 Touch ID issue? Maybe when iOS 9.2 is released. The Cupertino is currently beta testing the new version of iOS 9, and its second public version was released on Wednesday, but it not sure if it will solve Touch ID issue.