Yeah, as I mentioned before, dealers now have long awaited tech bulletin and disc for 3680->3690 updates. The label on the disc itself indicates that it can also do 2625->3690 updates, but it is not approved by VW for that.
That said, I used the disc to update my unit that came with 2625 and it seemed to work fine for me during the 5 minutes that I used it. YMMV, as they say. I have been much less successful trying to get an SSD drive to work, though. So far the only positive outcome of the experiment is that I can now swap out an RNS-510 hard drive in less than 20 minutes.