There has been at least one forum member who got upgraded from 1666 to 1668, but like I said, you need to not ask directly for it, tell them about the particular problems you have and let them work out if they need to upgrade...
Its really frustrating!
Even more frustrating when I tell you that 1668 breaks somethings and that 1671(I think) is around the corner and that maybe does Nav in dash as well as wireless Android Auto...(maybe AA isn't something you need) and possibly fixes bluetooth connectivity issues.