Hello. I can’t upgrade the Snzb 02 d device to version 2.3.0 please help.
Try it via the app, via Bluetooth 
>Pilot function>ota update
Yesterday I discovered this feature for snbz 01m 
, I’m ashamed to admit it, because I’ve been trying to do it differently all day.
If an update is offered and it doesn’t work, what helped me once was to remove the battery, reinsert it, and try to run the update again, but it takes a really long time on all ZB devices.