Hiho,
you just have to use the exactly same username in garena (as account name) as you used in b.net to be able to load your hero with the exactly same code.
Just type in your code in-game to load your hero successfully. 0.o
Btw: You can't change your name in garena in LAN mode as it will be only visible for you but you need the same name as account name in garena to make it working.
Robbepop