MODX Owner's Manual pg 19:

Restoring the initial factory settings (Initialize All Data)

NOTICE
When the Initialize All Data operation is executed, all the
Performance, Song, and any system settings you created on the
Utility display will be erased. Make sure you are not overwriting
any important data. Be sure to save all important data to your
USB flash drive before executing this procedure (page 60).

1 Press the [UTILITY] button or touch the
UTILITY icon in the upper right of the screen
to call up the Utility display.

2 Touch the [Settings] tab in the left of the
screen and then touch the [System] tab.

The entire system setting display appears.

3 Touch [Initialize All Data] in the lower right of
the screen.

The display prompts you for confirmation. To cancel this
operation, touch the [Cancel No] in the screen or press
the [DEC/NO] button on the panel.

4 Touch [Yes] in the screen or press the [INC/
YES] button to execute the Initialize All Data
operation.