As with many OS upgrades, iOS 11 also brought with it some annoying bugs. iOS 11.1 which arrived just last week also had a bug which caught immense attention all over the internet. Apple has finally released a fix for this bug with the latest release of iOS 11.1.1.
Many users started complaining of a bug which caused an error on the iOS keyboard as they couldn’t type the letter “i”. When the letter “i” was typed on the keyboard, it would be autocorrected to unicode [?] symbol. This would appear as a predictive text, and would automatically change unless the user corrected it themselves. Prior to this update, Apple had responded with a suggestion to use Text Replacement that allowed users to type letter “I”. However, a permanent fix is what was needed, and Apple has issued one.
iOS 111 update
In addition to this, iOS 11.1.1 update also comes with another bug fix for “Hey Siri” command not working on some devices. iOS 11.1.1 update is 53.5MB in size, and is currently available to download. You can find the update by following these steps – Settings -> General -> Software Update. Apple had also released many bug fixes with iOS 11 for problems like pictures blurring, live photo effects playing slow, among others. Apple also fixed issues like cleared Mail notifications reappearing on lock screen. 
Speaking about bugs, just a day after iOS 11.1 was released security researchers exploited Wi-Fi and Safari browser on an iPhone 7. These vulnerabilities were exploited due to bugs existing in iOS 11.1. Apple also recently released iOS 11 stats, which is now running on 52 percent active devices. However, iOS 11′s performance is slower than iOS 10, which reached 60 percent devices at the same time last year. iOS 11′s comparatively slow performance is possibly due to various bugs that arrived with the OS.