@emil, take a look at the first part of @rickkas7's post in regards to flashing rc25 to your device. You can apply the same approach for the Xenon.
Make sure you grab the correct bin files for your Xenon.After flashing the hybrid bin file, flash the tinker bin file as well. After this, hold the SETUP button for more than 10s to get the rapid flashing blue then try setting up using the phone app again.