By now I am sure you have your answer, but I just spoke with Tech Support and they said that the DS-708 is now considered "Obsolete" and will not work with any vehicle newer than 2014.
They must have manufactured a bazillion DS708s at the end, because I see pictures of stacks and stacks of them from online dealers for them. The price ($820) is attractive for us small shops where we essentially don't see the newest vehicles that are on warranty, or even new enough that owners patronize the dealer service departments.
The suggestion was to purchase a MaxiSYS uni and to not use the DS708.
I asked about updates for the DS708 and was told that new updates would be essentially useless from here on. Reading on the forum, I've learned that if these units communicate with the Internet after their subscriptions expire, they are rendered useless by the Autel company, so when they say "Obsolete," they mean KAPUT!
I suggest that you verify this since I am new guy here, but that's what I was told, anyway.
Bob