No, there Is not a 4.00 CFW out, nor Is there expected to be one for a little while. Best chance is to downgrade with an E3 Flasher.

---------- Post added 01-17-2012 at 12:17 AM ---------- Previous post was 01-16-2012 at 11:54 PM ----------
There Is no current CFW for 4.00 or anything above 3.55 for that matter, nor will there be soon. Your best shot is downgrading with an E3 Flasher