Apple stopped signing codes for iOS 14.4.2 blocking downgrades to the operating system following the release of iOS 14.5 and 14.5.1.
The halt of iOS 14.4.2 code signing comes one week after Apple issued iOS 14.5 and days after 14.5.1. With Apple no longer authenticating iOS 14.4.2, users who upgraded to 14.5 or 14.5.1 will no longer be able to downgrade their operating system.
Apple stops signing legacy code after the release of a new iOS build to protect customers from hackers and jail-breakers. It also prevents users from downloading older code to keep iOS fresh and asks users to use the latest software build.
Beta versions for iOS 14.6 were released last April following iOS 14.5. The point update is not expected to deliver any major changes or feature add ons to iPhone operating system.