Hello
I upgrade my Iphone from 3.1.3 to 4.3.3 with ultrasnow and with some help from TU and IREB to get through many errors. After all I got my Iphone in a DFU loop. I tried using iREB's fix recovery and the iphone displays a white screen and then the black screen with the white text on it (it says greenpois0n intialised) and after a lot of 'white texts' it goes again in the DFU loop.

I didn't save my shsh and I use it with a different carrier (not AT&T).
I don't really understand what those SHSH do, and I don't know what to do.
Anyone can suggest any help?
Thanks.