If your Xio will not boot up for one reason or another, it is possible to reload the operating system using an Emergency Software Upgrade procedure. To start up the Xio in this mode, hold down the following buttons during startup:
[OCTAVE UP] + [OCTAVE DOWN] + [PLAY/SYNTH]
(Hold down during Xio start up)
Once the Xio starts up in Emergency Software Upgrade Mode, you can follow the usual Software Upgrade procedure described in the Xio User Guide.