Apple systematically stops signing older firmware for its mobile devices a couple of weeks after a new firmware release to prevent downgrades. Although they’re slightly late this time around, they’ve closed the signing window for iOS 10.3.2 three weeks following the release of iOS 10.3.3.
Now that Apple has stopped signing iOS 10.3.2, iOS device owners will not be able to downgrade back to the OS. With no iOS 10.3 based jailbreak in sight, there’s little reason for one to run a slightly older build of iOS 10.3 on their iPhone or iPad.
iOS 10.3.2 was a minor update aimed at fixing some security vulnerabilities. Similarly, iOS 10.3.3 is also a minor release aimed at fixing some security vulnerabilities in the OS including a vulnerability that could allow a hacker to execute arbitrary code on the Wi-Fi chip of certain iPhone models. So, if you have not already updated your iPhone or iPad to iOS 10.3.3, make sure to do it right away.
Apple’s choice to stop signing older firmware versions is without a doubt fueled by a desire to keep jailbreaking at bay in addition to keeping its devices as safe from malware and other threats as possible.
iOS 10.3.3 is the last release of iOS before Apple releases iOS 11 later in September. The upcoming version of the OS comes with a plethora of new features including a redesigned lock screen and notification center, redesigned Messages app, smarter Siri, and more.