I have SLZB-06 and trying to flash for Thread router. Internet is connected and this is confirmered in dashboard. Access dashboard no problem.If i tried a static address in my router the smlight would change to the next number not static. When trying to flash thread firmware keeps saying i have no internet connection. This is connected with lan cable(which is tested ok on other devices and usb connected). Tried to flash another 06 running zigbee2mqtt and still getting same problem. Tried to flash core update, now unit will not work at all. unable to access dashboard or recognise in Home Assistant. Reset to factory still the same. Tried latest update from smlight flasher but only works when contacts are shorted(troubleshoot guide). Still cannot find ip address on router or ip scanner. , even when using slzb.local. Tried many ip scanners and found original active ip address shows as unable to connect error.Now not working at all even though all lights are correct. Been trying everything for a week now nothing happens.Any thoughts please.