After upgrading to iOS 10.2.1 iPhone owners are reporting the update has broken Apple’s fingerprint reader.
The problem primarily appears to impact iPhone 6 and iPhone 6 Plus owners and logical options such as removing and re-adding fingerprints and a factory reset doesn’t work. Interestingly downgrading to iOS 10.2 is reported to fix the problem, which isolates iOS 10.2.1 as the root cause.
