Augmented Reality for UE4

Hi, .
i am using Full Version, commercial ver.

  1. project works fine on viewport preview.
    and then i tried to package project for android, it works fine by installing with batch file which is generated by ue4 on my developer mobile.
    but that means only android system with developer mode turned on is working.
    i tried many different phones without developer mode, always gives me the result with webcam init error on any different mobile
    (.apk packed with .obb and without .obb tried both)
    (i tried packing win version, and still it gives me webcam init error)

  2. also some of phone are just crashing. lg G5 and J5, J7 they are at least android 6.0

do you know why its happening? any idea?
thx

— added —

i just tested again with new project and copy paste provided SampleProject files to new project
then packed without change any of assets

still it crashes in G5, J5, J7
i used 4.19.0
c++ project, empty
mobile, scale 2D,3D, no start contents

crash message “Unfortunately, [TestProject, project name] has stopped”

— added(2) —

i solved problem (1) it was the problem of obb folder location,

"
In SampleProject\Plugins\ARToolkitPlugin\Source\ARToolkitPlugin\ARToolkitPlugin_APL.xml locate this line:

String obbPath = Environment.getExternalStorageDirectory() + “/obb/”;

Change it to:

String obbPath = Environment.getExternalStorageDirectory() + “/Android/obb/”;
"

but still doesnt work for windows and crashing problem is there.