yes, as long as you know how to do it
is there any tutorial ?
If u're using MSVS, something like:
open core.h file. Find: #define PACKET_OBFUSCATION. Righ-click on PACKET_OBFUSCATION, select Find All References. Copy source block inside it. Find proper/equal lines for the old rAthena, paste there. Copy the keys on packet_db.txt to old rAthena's packet_db.txt
thank you dear