Casio’s Privia Pro PX-5S is a stage piano that also includes an advanced MIDI controller and a performance synth onboard. The range of features is has, coupled with the easy-to-use console, you have a digital stage piano that really does not hold you back in any way. The Casio Privia PX-5S at just 24 pounds is lightweight, the lightest 88 keyboard I have found in the market today. The piano is very elegantly built, and certainly has a lot of style to it. The weight of the PX5S is minimal, so it is ideal for the musician that needs to take it from place to place when playing at different concerts and gigs.
According to several user reviews, they have praised Casio Privia PX-5S for the Dazzling EP, Clav, and complex synth sounds; Deeply programmable synth with realtime control; Four zones each of internal and external MIDI controller capability; Battery powered; Stellar 88-key weighted action; Impossibly low weight and price. Also, some users have complained it for no expression pedal input, split button (though splits can be programmed), or music stand; Editing can be challenging without the free Data Editor software; Tonewheel organ emulations don’t match the high standards set by the rest of the sounds.
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To restoring Casio Privia PX-5S to it’s factory settings, just simply power ON while simultaneously holding the  and the [NUM KEY] button until the “Initiallizing” appears on the dispays. The Factory Reset procedure is complete.
Warning! This operation will return all of the settings to the values when the Casio Privia PX-5S was shipped from the factory. Before you perform this operation, check whether there is any data you want to keep. Hopefully the article of “Reset Casio Privia PX-5S Pro Stage Piano” can help you.
Reference: Casio PX-5S manual