Just wanna make sure guys... I sold my VIP4 JB 4.2.8 phone to get the 4S. bottom line, should of never done this. Now, I found a VIP4 4.2.8 on CL, and i have a good trade in line. Can I just use the custom ipsw thru PT i used from my old VIP4 to jb the one I get from CL? I don't have to worry about shsh and blobs right?