Guild Wars 2

I brought the game at 2013 and spent some gem to buy a bone pick that time. Which at that time, is soul bound after equip. Now there is a Bone Pick in the store, which is exactly the same and account bound after use. I want to know if there is a way to make my old soul bound bone pick into new account bound pick>? Or maybe plz tell me when did the bone pick in the store turns into account bound after equip?

Check the wiki: http://wiki.guildwars2.com/wiki/Bone_Pick

it says: “Soulbound versions of this item can be exchanged for account bound versions at a Black Lion Weapons Specialist, but the tool must first be unequipped and in your inventory.”

Gem store tools became accountbound a while after they were introduced, with future accountbound tools being slightly more expensive than the old soulbound tools.