iPhone Upgrading iPhone4 on 4.2.1

[randomer]

I have an iPhone 4 on 4.2.1 that I need to upgrade to iOS 6 < 6.1.3 - is that possible?

 

[Tyler23]

I have an iPhone 4 on 4.2.1 that I need to upgrade to iOS 6 < 6.1.3 - is that possible?

If you have SHSH blobs saved for whatever version you're trying to upgrade to, then yes.

If you don't have SHSH blobs, then no.

 

[Dave Felix]

You have to read other post before you start posting.. everyone has asked this question and most answers are "no". Apple isn't signing iOS 6.