1. The sever must have " FA changer " NPC, or smth similar.
2. Open phx, open l2. Exchange your FA to Adena and Adena back to FA, and catch 2 packets ( FA>Adena / Adena>FA ).
3. Add the packets 15x times to phx and press Send many times, till your phx/l2 crashes.
4. Login and enjoy duped adena/FA )
Note : You must have much adena and FA, for example if you dupe 100A and 50 FA, you must have 300A and 150 FA in your inventory.