I have just updated both of mine. There is one undocumented trick that you need to know (or at least that I needed). i have the XQD card set up as my primary card. When I tried to upgrade from the bin file on the CF card there was no update option. In both of my D4s I needed to remove the XQD card before I could update. Then no problem. Hope it helps if anyone else is having the same problem.