iOS 11 downgrade to iOS 10.3.3 possible via SHSH2 blobs?

[greattrika]

Hello,

I received an iPhone 7 Plus iOS 10.3.3 from my sister and I have an iPhone 6 with iOS 10.3.3.

I would like to know on my iPhone, how is iOS 11.2.2. But if I make this and later I don't like the performance or design. I can downgrade back to iOS 10.3.3?

Buddy said it could work with SHSH2 https://tsssaver.1conan.com/
Currently there is the Jailbreak for iOS 10.3.3
1. Jailbreak the iOS 10.3.3 on your 2 iPhone. Then can you use save the SHSH2 blobs
2. Update to the iOS 11.2.2.
3. Now I hope in the future there will be a jailbreak for this version iOS 11.2.2 version.
4. If it comes a jailbreak for iOS 11.2.2. Jailbreak this version and save the blobs
5. Now I can downgrade to iOS 10.3.3
6. This iOS 10.3.3 is a jailbreak version

is that really what the buddy said? must it be? is it possible to do without jailbreak?

 

[Manatlt]

Your phone you want to downgrade has to be already jailbroken.