Thanks Tone for your sugestions.I will do a file backup near in future.
I cant help myself,but dont you agre with me thouse behavior from Ketron is strange in some way?You prabably never send an instrument directly to factory for repering and if you do then is normal(I thing so)they must to provide some report what they do? That instrument is my property and no one (also Ketron)cant do nothing withaut my permission and my right is to know what they realy do and hes right and duty is reper some eventual troubles(in waranty period).Right...?