Need Help Reimport quickbms

[kkbs4u]

I have a file "pakchunk1-Android_ETC2.pak" this is belong to Android game I unpacked the file with "unreal_tournament_4.bms" script and it will successfully unpacked I was modify some files inside pak files and repack it again with same "unreal_tournament_4.bms" script but game sudden crashed when I open that mean game not accepted the pakchunk1 Android ec2.pak why this happened where I am wrong please help me