Same with the XR500! No updates for over a YEAR. Not even security updates. The XR500 was marketed by people (including LinusTechTips) saying that there will be frequent updates and that DumaOS will just get better with time. But as I said, there has not been an update for over a year..
There was the exact same router from Netgear but without DumaOS that was 120 euros cheaper. That means I spent 120 euros on a operating system that isn't even supported anymore. Since I bought the router, there has not been a single update.
At least give us security updates! https://vuldb.com/?id.154181