I have accidentally updated my real nand to 4.5 from 4.1. Luckily I was smart enough to try an update my emunand to 4.5 and not a higher nand in case something goes wrong when updating. I have a backup of my 4.1 nand. Can i restore my nand back to 4.1? I know there is no point in doing so since 4.5 is compatible with gateway.