Introduction
Tools
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The four longer keys from the fingerboard are to be handled from the left side to get them off.
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The eight smaller keys need to be levered from the bottom up.
 
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The scissor mechanism of the eight small keys are obstructing the underlying screws.
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By using again an opening tool or opening pick these can be snapped off easily.
 
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Loosen those 12 screws with a Phillips #00 screwdriver.
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Then just pull off the four rotary knobs and the volume knob.
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Now it is possible to slightly lift the keyboard and set it back.
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.