The CDP-230R satisfies every musical desire. With its improved tone for string instruments, scaled hammer action and AHL-quality sound, the CDP-230R offers piano fans a wide range of features and functions, and also boasts impressive digital effects.
What you get with the Casio CDP-230R is 48-note polyphony, 700 thomann sounds, 200 styles, 10 user styles, 305 music presets, 32 registration memories, sampling function, split/layer function, transpose function, metronome, reverb, chorus, 152 internal songs, pitch bend wheel, LCD display, Energy save mode.
Image source: thomann.de
To restoring Casio CDP-230R to it’s factory settings, just simply power ON while simultaneously holding the [SONG BANK] and  of the 10-key Pad. When the display appears “Pls wait” release all buttons.
Warning! This operation returns all settings you’ve made in the menus to their factory-set condition. Be sure that you want to do this. Hopefully the aricle of “Reset Casio CDP-230R Digital Stage Piano” can help you.
Reference: Casio CDP-230R manual