Download futurerestore for windows or mac version

Futurerestore was created to make possible downgrade or upgrade any 64bits , or 32bit devices not signed firmware using shsh2 blobs.

for example using this tutorial you can Upgrade with iPhone 7 from 10.1.1 to 11.1.2 using Futurerestore Windows Fork .

Check also: Restore iOS 11.1.2 Back to iOS 11.1.2 Using SHSH2 Blobs