Apple stops signing iOS 9.3.1: Downgrade from iOS 9.3.2 to iOS 9.3.1 is not possible

Apple has stopped signing iOS 9.3.1 for
all the iOS devices like iPhone, iPad and iPod Touch which means that
users can no longer downgrade their iOS to that version using iTunes.

Now you can’t downgrade to iOS
9.3.1, if you are on iOS 9.3.2 and also cannot upgrade to
iOS 9.3.1, if you are on lower versions. So basically you are forced
to upgrade to iOS 9.3.2 directly.

Apple always gives two versions of iOS
to restore whenever it releases a new version. So that people have ability
to downgrade their devices to the previous version if they are not
satisfied with the new one. But after some time, it stops signing the previous
version.

You can also visit this link https://ipsw.me to
check the signing status of Apple firmware.

Note: If you are on lower versions
like 9.2, 9.2.1, 9.3, 9.3.1 do not upgrade to iOS 9.3.2 because no
one knows for what version of iOS there will be a jailbreak. We all are
waiting for jailbreak to be released. So it’s better to stay on older
version of iOS for now.