Once you've downloaded the open atv image for your box extract it just put the zgemma file onto USB open the zgemma file if there is a file that says no force change to force completely power your box off by white button make sure no other USB connected insert the USB your flashing with power box on then when gets to hdmi setting go on terminal login as type root press enter then enter all this command opkg install
http://wbuildx.co.uk/setup.ipk press enter and infity should download if all else fails use grog free range image as that re flashes and installs the image for you