If possible you could hardwire the device to your local network/to your router.
This way you will be able to see the device in the app or read the ip adress from there or by using the Beotool app (I guess that should still be available from the app store).
The ip adreess typed in to a browser ill give you access to the configuration.
N.B.
Be sure to update the device, if needed before you unplug it from the network.
This way you may be able to set up a connection to the wireless network.
P.S.
If in any way possible, use a wired connection – the MK1 will work better with this.
MM