Someone know why isn't possible enhance jade accessories?

Because they are events gifts..I think.

So PA send us the Jade set twice and:
- we can't exchange it in Shakatu shop;
- we can't enhance them.

I don't see any sense in this. Meh.

Only awakening possible nothing else..

they are meant for 2 things:

 

1- help new players get more CP so they can catch up until they can get normal accessories.

2- for alts.