after run inferno mtk by default "high boot" is selected. If there is any phone which stop after "download boot complete" you can change it to "low boot" to check whatever it's complete it's boot or not. If both "high boot" and "low boot" unable to boot any phone then you can use "custom boot" and now here you have "free hand" to do experiments. You can select manually "da" or "auth" or "preloader" or all of them or any two or any one to make phone properly boot. Also you can use "custom boot" for boot "secure mtk phones".