My newest Dot (the white one) has software version 561179520
One Echo and one Dot have 4008. The other one has 4172.
If I understand this thread correctly, I need to update the Echo and Dot with 4008 and the one with 4172 is fine. But can I assume the newest Echo Dot, the new model (white) which has the VERY different software version, IS up to date? When I first plugged it in that was the first thing it did, update itself, and I assume it will be on a different OS from the other devices.