I am not familiar with GrogBuild, but this is how I use OsCam on my Zgemma H.2S running OpenATV 6.3 with WooshBuild Infinity. In Plugins, Softcams, I select and download Oscam-Stable (1.20+svn11518-r4.0). Then using FileZilla I select etc/tuxbox/config/oscam-stable and edit the config.server file. After I delete all in config.server file, I copy and paste the Provider's OsCam code (first line is [Reader]) into the config.server file. Finally I save, upload and exit FileZilla.