There are times when the jailbreak community experiences a hard time adjusting to the new iOS releases. With some security patches from Apple, it is even harder for them to cope with such development. At the same time, there is no proof yet of a jailbreak for iOS 10.3.x and 10.2.1.
According to sources, Luca Todesco, a skillful hacker released a statement that he will stop working on public jailbreaks after the 10.2 exploit. So, you might have wondered how it is possible to jailbreak iOS versions 10.3.2, 10.3.1, 10.3, and 10.2.1.
For now, it would be safe to say that the jailbreak community is going to lay low for a while. They might be sitting quietly looking for exploits to be used for iOS 10.2.1-10.3.x, but no confirmation has been shared in public yet.
With iOS 10.2 still being signed, users who upgraded their devices to 10.2.1 should step back a notch to 10.2 in order to enjoy the benefits of a successful jailbreak. The only thing that might keep you from it is that it the Yalu jailbreak won’t work on iPhone 7 and iPhone 7 Plus.
The first ever jailbreak release for the public intended for iOS 10 was based on the Project Zero from Google. It was the Mach_Portal+Yalu that was able to do it. However, the technique used by yalu102 for iOS 10.2 was different, which doesn’t work on iPhone 7 64-bit devices. Moreover, it has been patched by Apple in its release of iOS 10.2.1.
Having said all that, you might already have an idea about the true status of iOS jailbreak for 10.3.2, 10.3.1, 10.3, and 10.2.1. Consequently, you should downgrade up to the last version being signed by Apple before you jailbreak your iOS devices to ensure success.