Apple does not permit this sort of downgrade because of a safety mechanism known as BBTicket, this service will not solely permit the downgrade firmware with out SHSH saved and particularly the downgrade baseband 04.11.08.
Apparently the concept of server are available halfway from the developer Sim GEVEY which might proceed gross sales of probably the most well-liked sim for iPhone Desimlock 4.
Hopefully this server truly makes its look . . . . wait and see