I will tell about duplicate item using auction/ UTS (place for buying and selling item)
Can Work RF Online Japan, Brazil, Korea, International...
Example i will duplicate Relic Sword level 50..
1. I have A and B character.
2. A character have Normal Sword lvl 50, and B character have relic sword lvl 50
3. A character sell normal sword in auction (example Price : 1 CP)
4. B Character sell relic sword level 50 (example Price : 50 CP)
5. A character log out from account to choose charater.
6. After that A character login again, click auction and choose sword level 50.
7. After that character B log out from game to choose character
8. when B character log out will count down.. (9..8..7..6................1)
9. when count down... A character click his item (normal sword level 50), after that click relic sword level 50... and BUY!!
10. A character have 2 sword now.. normal sword and relic sword
11 And After B character login again in game.. B character still have relic sword in auction.. and you can cancel that's item in auction...
12. So A and B have relic sword lvl 50 ^^...
I'm happy use this bug in RF korea client and RF japan client... and i have maximum money and item because this ^^...
Lastly, press thanks if it Helps