I bought a Korg ToneWorks AX1000G recently, and the prior owner had a lot of custom settings on it that I needed to erase. I needed this thing back on factory default settings. To do so, you need to do the following:
Hold down the Bank and Exit buttons while turning on the power (as shown below). The unit should display RELOAD? in the display. Once this shows, you can release the buttons, and to confirm, press the Write button. When finished, the unit will display COMPLT when finished.