Cydia -> Manage -> Sources -> Edit -> Add -> Ingregás la source: http://cydia.hackulo.us -> Add source.
Ya agregada: Cydia -> Search -> buscás "AppSync" -> Click "AppSync for 3.0" -> Install -> ¡Listo!
Ya agregada: Cydia -> Search -> buscás "AppSync" -> Click "AppSync for 3.0" -> Install -> ¡Listo!