airis kira N10021help for reinstall image

Dear Friends
i have AIRIS KIRA N10021
when start after AIRIS logo a symbel (-) blinking in center of screen.
i try many site for downloading firmware of this and try for image file.
but when i win image software start in my laptop and insart SD card(4GB)
in card reader slot. But when i select SD card and run the software after a 1 second errer 5 show and stop the work. When i check 4GB card property it show 750MB. But image file is not create in SD card.
plz help me.