The Creator of iOS 10.2 Luke Todesco urged iPhone and iPad users to store digital certificates SHSH2 blobs. It must be done before Apple stops signing the OS version.
Today, as promised, the Italian developer has released a jailbreak tool for iOS 10.2. At the moment Yalu102 only supports a few devices – iPhone SE the iPhone 6s and iPhone 6s Plus, iPad Pro, on Todesco working on expanding the list of compatible gadgets.
As Yalu102 does not support iOS 10.2.1 and 10.3 of iOS users who plan to jailbreak, it is recommended to save SHSH blobs, that at any moment you could roll back to iOS 10.2.
To save digital certificates there is very little time. Apple can close the hand at any time.
Note that the Yalu jailbreak is only compatible with iOS 10.2 and earlier versions of the OS. The tool is designed for hacking the iPhone and iPad and is implemented in the form of IPA file to upload to the gadget using Cydia Impactor. How to jailbreak your iOS 10.2 through Yalu published here.
Keep SHSH2 blobs for iOS 10.2 is possible according to the instructions on this page, or by using a free web service TSS Saver. Read more about how to work with TSS Saver and check the health certificate you can find at this link.