Try booting to RGH with the disc already in the drive...Update went fine on the retail nand. Boots straight up no problemx. For the cygnos I had to dump the new retail nand from the 14699 dash and rebuild my image through multibuilder then it boots straight into 13604. I lost the kinect update and avatars for the moment on te cygnos side.
Bizarre thing is when I put in a retail kinect disc on the glitched dash, to put on the update, it comes up as play dvd. Everything on retail dash is normal. Getting to late to play around too much. I'll get back to it tommorrow