How to Reset the Boss GT-10
- 1). Press the black "SYSTEM" button. The setup menu will appear on the display screen.
- 2). Turn the large, black dial at the right of the display screen until the "Factory Reset" option appears on the screen.
- 3). Click the "Category/Enter" button twice to reset your GT-10 settings. The "Category/Enter" button is below and to the right of the dial.
Source...