ios 6 iphone 4 downgrade to 5.11 ?

[misterminibus]

I have an iphone 4 which is on o2 and I need it to work on 3 so I need to jailbreak it, however it seems the only way to jailbreak it is using shsh blobs with a program named tinyunberella using redsn0w. Does anyone know of a way to do this without the blobs?

 

[maflynn]

Without the blobs you cannot downgrade iOS

 

[misterminibus]

are the blobs specific to each phone or can you use blobs from another similar phone?