First of all, is this the right place for bug reports?
I just upgraded from the v1.27 to v1.28 via VRM portal. After that the network connection was broke. No connection. Via bluetooth i tryed multible times to reconfigure the connection, did restarts and so on, with no results. Only error message was like no connection to cerbo gx. My unifi system did not see anything from the device since upgrade. Thankfully it was possible to configure the AP Mode via bluetooth. So I managed to downgrade manually to v1.27 via that AP connection. After that and without further configuration the local network worked like before.