Thanks for reply guys,
Im using this method "just set nothing as a loader layout" and there is this black screen at start, which look really unproffesional, but if there is no other solution...
Well my hopes were pretty high after I read this part of Ashly's tutorial.
"1. Loader layouts are not shown when publishing as native apps on mobile (e.g. via PhoneGap, CocoonJS and appMobi). This is because the entire application is downloaded at once. Since all files are immediately available, nothing needs to be downloaded. For these platforms you probably want to focus on a custom splash image instead."
But there is no explanation how to use only splash screen. SO here I am trying to get some help
EDIT: There is still problem, why the default C2 loader layout shows up, even if I use only loader layout. I set in project settings "custom loader layout" and "Starting layout -> CustomLoading".