ts1 kr: how to downgrade?

how and where I can downgrade items with red jade in ts1? i want to downgrade rare m2 spear 102% cs0 to r105, how can i do it ?

You need a downgrade scroll in ts1 from what i remember.

ohh thanks, how much it cost bro?

It's an "AP" or whatever it is called in ts1kr item, so probably quite expensive.

damn :/ thanks anyways bro