The exploit I found is pretty simple.
1. Reinstall the game ( Or if there is anyway to remove the saved data of the game would be easier )
After Reinstalling the game start it and you will get the tutorial message that ask you to complete the tutorial and get some mp and a gift with all weapons for 3 days. And when you complete the tutorial you got the mp and the gift with all the weapons for 3 days. Well I had something like 36 000 mp and after that I had 51 000 not pretty sure if that is the exact amount I got but its around 15 000 I think.
P.S. I've done it only once and I am not pretty sure if its going to work 2nd time , 3rd time , etc ....
If anyone want to try to do it few times and confirm would be nice :P