Guild Wars 2

I have a question for those upgraded their backs,
I have made the book version of the back and soulbound it on my guardian
If I upgraded it to infused version
Will it come soulbound on use?
Or its still soulbound on my guardian

It’ll become soulbound on use/Account bound(yes both of them). HOWEVER….it will become soulbound when you use it. so in otherwords it “Resets” the soulbound. At least thats what I remember reading about a few weeks ago.