downgrade 7.0.4 to 7.0.2

andy289

hi ... i from malaysia ... anyone can teach me how to downgrade?now i already install 7.0.4 but i forgot the password! because normally i just save at the phone i didn't remember it ... then when i install 7.0.4 i cannot go in the phone. my frien was told me just downgrade it to 7.0.4 to 7.0.2 because 7.0.2 not yet got that function anyone can help me ? Thanks a lot !