grigosavos

yes, now it works just fine again. it is the second time this happened to me with this solution by the way. btw. it's called usb-stick in german, it's of course the same meaning as "USB flash drive", just in case anyone is wondering...

i was able to start the celviano gp310 by plugging in an empty(!) usb-stick (the same usb-stick with data on it didnt work) and then suddenly got through the welcome screen and the piano worked just as always. just to be sure i did a factory reset and after that i could start the piano again without the usb-stick. maybe this helps someone.