Analogus thanks tons for explaning it again
something weird happened. It worked. I then changed fonts to can't remember, maybe "Custom 1" from Sony fonts, and the reader booted itself. The thing is that it keep on booting and re-booting, and never gets to the desktop. I tried to reset it, flash it, it won't work. The only thing that really work is: if I connect it to a PC, wait for it to be recognised as hard drive + disconnect it, it works, though PRS+ is no longer there. In fact, it is there, but the device ignores it, and works on the original sony settings....
any idea?