@jabirulo
The "problem" is the graphics.library.kmod. So I copied the library from the update 2 over the one included in the update 3 and my Radeon M9 of Sam440ep can, now, display the 320x240 resolution. (I need that resolution for the emulation of old system like megadrive,snes, neogeo and so on..)
@pvanni
yes, on amiga, you can clone the hard drive just copying the content of the old one over the new one. But in this case I wanted to create a fresh and clean installation instead of having a "mess" hd

LOL!