I haven't used the built-in updater for a long time, since it can't handle S2 devices.
If you're willing to try something else, I came with the steps below to do S2-device updates, but it works just fine for non-S2 devices too.
I realize it's more steps than the built-in option, but I've updated a wide variety of Zooz devices many times using these steps and they've never failed me.