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Assuming that you have already JB’ed, and you already have the akward repo installed….
$ echo "deb http://mirrors.xbmc.org/apt/atv2 ./" > /etc/apt/sources.list.d/xbmc.list
$ apt-get update
$ apt-get -y install org.xbmc.xbmc-atv2
It will install and reboot Lowtide…..