Now I'm trying it.. And I didn't know that a post can't be deleted..
Finally it works on my DR800SG.. Thanks for Iņigo and CoolDragon who advised to me
I felt that the device appears a totally different one! So fantastic.. Maybe it became the uncomparable device now on the earth I think..
btw, how could we show at once all of the four icons(pen, eraser, zoom, panning) which are combined in one 'shortcut arrow' icon at the right in the bottom status bar? I think it would be more convenient..