Possible to downgrade FW on iPhone 4?

[lilrush]

If you have SHSH backed up for 3.1.2, 3.1.3, and 4.0, can you downgrade an iphone 4 to 3.1.2? Just curious, and couldn't find this answer around so my guess is that you can't but it's worth asking.

 

[twoism]

Pretty sure you can't, since every SHSH is unique to the device, just like a serial number is. And since iPhone 4 has never been on 3.x.x then you can only downgrade from 4.0.1 to 4.0.

 

[mavis]

The iPhone 4 was launched with iOS4. Earlier versions of iOS were never available for it.

 

[andybno1]

plus even if you could downgrade to 3.1 on iPhone you wouldn't be able to jailbreak as the jailbreak is hardware based and the iPhone 4 has new hardware

 

[dhlizard]

If you have SHSH backed up for 3.1.2, 3.1.3, and 4.0, can you downgrade an iphone 4 to 3.1.2? Just curious, and couldn't find this answer around so my guess is that you can't but it's worth asking.

It's not possible to back up hashes for 3.x.x on an iPhone 4.
Hashes from a 3GS won't work nor will hashes from a different iPhone 4
An iPhone 4 certainly wouldn't run with 3.x.x firmware anyway.

Fail.