Apple stops signing iOS 13.3 ahead of new jailbreak
(iMore iPhone)

What you need to know Apple has stopped signing iOS 13.3. That means it can no longer be installed. A new iOS 13.3 jailbreak is around the corner. That`s not a coincidence. Apple yesterday stopped signing iOS 13.3, preventing anyone from installing it on their devices. The same goes for iPadOS 13.3, too. As a result, the oldest version of iOS and iPadOS that can be installed is 13.3.1. That update has plenty of improvements including fixes for Mail annoyances. And Apple routinely stops signing older versions of iOS once new and improved versions are available. But this time it`s likely Apple`s motive is at least partly related to the jailbreak community. The popular unc0ver jailbreak is almost ready with a version that will support iOS 13.3. That means that people may want to downgrade to that release in order to jailbreak, and that`s exactly what those in the jailbreak community have been doing. But they can`t do it anymore because, you guessed it. It`s no longer being signed...