so the green light is on / off, assuming that the device is not connected, also pulling out the menu from the top right corner (device-list) doesn't show any device.
- make sure the mini USB still works (some users broke it by pushing it too hard, it's quite fragile)
- connect the mini USB on the device
- power off the device
- power on the device
see if this will work, and then use "add new device" to reset the wifi of FLUX-Delta
if the USB does not work, you may request for a "special" cable that can connect directly to the board through the filament compartment (through help desk)
worse, all failed, please open a ticket