Unregister "KATANA-AIR MIDI" on the mobile device, then on the mobile device, again turn Bluetooth off and back on.
For iOS
From the iOS "Settings" menu, select "Bluetooth," and if "KATANA-AIR MIDI" is displayed as "Connected," tap "i" to unregister it. After that, turn Bluetooth off and back on again.
* At this time, leave it unpaired and close the screen.
If it was inadvertently paired, unregister it again.
For Android
From the Android "Settings" menu, select "Bluetooth," and if "KATANA-AIR MIDI" is displayed as a paired device, tap the "gear" icon next to it. In the window that appears, unpair the device.
After that, turn Bluetooth off and back on again.
* At this time, leave it unpaired and close the screen.
If it was inadvertently paired, unregister it again.