iOS 10.2 downgrade is possible, believe it or not, if you are currently using iOS 10.2.1, or better iOS 10.3 beta 1. We are talking about an anomaly that allows some users of iPhone terminals 5S, and iPad Air, which have iOS 10.3 beta 1 installed in their own terminals, can downgrade to iOS 10.2 right now.
Everything is based on a matching of nonces between iOS 10.3 beta 1 and iOS 10.2, this allows users to downgrade iOS 10.2 at the moment. At the moment, all those who have downgraded iOS 10.2 can use the Yalu jailbreak solution to exploit their terminals and enjoy what the jailbreak solution offers.
Before you get too excited, I tell you that in order to do this iOS 10.2 downgrade, you must have shsh2 files saved on your computer beforehand. If you haven't saved them and you don't have an iPhone 5S or iPad Air, then there's no point in even bothering, because this anomaly of Apple's servers cannot be exploited by you.
iOS 10.2 downgrade is possible on iPhone
If you meet the above conditions, then in order to downgrade iOS 10.2 there must be a match of nonces, a good example for these being: 9e4c518009d00df190a450b3b47691768812360c
si 9f4aeec726e7c682339ddb3c6c2dec52662dc517. Futurerestore is the program that must be used to downgrade iOS 10.2 and you will have to try it to see if it is possible.
The problem is that this whole procedure works exclusively from iOS 10.3 beta 1, but not from another version of iOS 10, so don't try it elsewhere. To see if you can downgrade iOS 10.2 you can use the noncestatistics function to see if your nonces match those of iOS 10.2 and you can downgrade.
As usual, this procedure for iOS 10.2 downgrade is very complex, very limited and applies to an extremely small number of people. The chances that you will be able to enjoy it are extremely small, so don't expect to be able to downgrade iOS 10.2 in the end.
