Upgrade Item

Hi. There was a bug to improve item without using cash.
But now I cannot use it more.
There is a message that the item is already in use during the trade.
Can anybody help me please?
It's very expensive to buy the amount of cash necessary to upgrade many items.

There was a bug like this.....? I never knew T_T

How does it work?

Tell us pls the Bug we dont know of it, then we can help you.

omg dont spam the bug dont excist anymore it is Patched !