Hi, I have an "update.img" for firmware for my Arnova 9 G2 android tablet. When i transfer it to the tablet and restart it is does not seem to like it and shoes message saving "found an invalid image file '/mnt/storage/update.img'.... i obtained the file from Arnova website. What am i doing wrong? SPEC: Model - AN9G2 Android v - 18.104.22.168 Biuld No. - GINGERBREAD.eng.20111118.10706 Please assist. Thank you.