There haven't been any Asus firmware updates to this router, if you go to the Asus website there are still none listed. But if you look up the RT-AC68U which this router is based off of there are a lot of recent updates.
Best answer by bst82551
There's a new update out. I don't see any new features, but maybe they fixed some of the wifi calling issues and addressed some of the security concerns.
The update must be done manually. I left instructions on how to do that about 10 posts into this thread:
Mod edit: You can get the firmware patch notes here: Cellspot router firmware update information 😊