I’m also having this issue. I Did an erase flash option, then reinstalled the build and then the file system image. I can then connect but it still times out and then it disappears until I wipe it and install it again.
Solution found: after entering router/password the SSID broadcast stops, controller boards collects a DHCP IP address from router and you have to connect your computer/mobile to the new IP address to see DiyBMS data.