Apple Stops Signing iOS 10.2.1 and iOS 10.3, Downgrades and Restores No Longer Possible
Apple has stopped signing iOS 10.2.1 and iOS 10.3 which means that downgrading or restoring to those firmware versions is no longer possible.
Currently, Apple's latest firmware is iOS 10.3.1 and developers have been seeded with iOS 10.3.2. If you accidentally update or restore, you'll find yourself on iOS 10.3.1.
It could be quite some time before another jailbreak surfaces as Apple has switched to the APFS file system with iOS 10.3 which may introduce new challenges.
vit : iclarified
Apple has stopped signing iOS 10.2.1 and iOS 10.3 which means that downgrading or restoring to those firmware versions is no longer possible.
Currently, Apple's latest firmware is iOS 10.3.1 and developers have been seeded with iOS 10.3.2. If you accidentally update or restore, you'll find yourself on iOS 10.3.1.
It could be quite some time before another jailbreak surfaces as Apple has switched to the APFS file system with iOS 10.3 which may introduce new challenges.
vit : iclarified