Cant i make half human bonus now?

Hi,

I have a Phoenix Bow with full Bonus. And im told i cant get Halfhuman as a bonus in it?
Is it true that the Giant Devil bow should have the half human bonus before it is changed?

Please help.

I didn't find the right solution from the Internet.

References:
https://board.en.metin2.gameforge.com/index.php/Thread/90830-Cant-i-make-half-human-bonus-now/
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Thanks