1] open FNRGSSet.ini and change like under
FNRBloodItemType = 14
FNRBloodItemIndex = 11
---> Lucky Box
2] open GS with ultraeditor under code
8B55F8526A
00 6A
00 6A
00 6A
00 6A
00--->
8B55F8526A
09 6A
09 6A
09 6A
09 6A
09### 00 : Reward Item Level
09 : 14 11 9 0 0 0 0 (Kundun Box +2)
3] You can change Level according to your will