【item upgrade】
http://en3.babyran.com/extend/webupitem.aspx
If your equipping the top equipment and want more powerful and stronger,
just by click “Item upgrade” on website. (Recommend to the max)
For upgrade the power of your weapon or armor
Please process it by website (just by click the “Item upgrade”)
Armor ups effect by dexterity and power attack but not effect by spirit attack.
Reminding: ups for weapon or armor can not roll back to EP.
Upgrade by the Item in the game: 
+1 to +6     100%   successful   
+7     25%   successful  and maybe will cause the sequence is:
remain the same level or with possibility that your weapon or armor maybe disappear. 
+8    10%   successful  and maybe will cause the sequence is:
remain the same level or with possibility that your weapon or armor maybe disappear. 
+9     5%   successful  and maybe will cause the sequence is:
remain the same level or with possibility that your weapon or armor maybe disappear.

【item change】
http://en3.babyran.com/extend/itemTransfer.aspx
1,EP items upgrade to high level items
Upgrade items will charge the price difference only.
EXP1: Fire Mask(260 EP) upgrade to God of Wars Helmets(4172 EP)
Charge will be 4172-260=3912 EP.
EXP2: Fire Pants(260 EP) upgrade to Elf Pant(788 EP)
Charge will be 788-260=528 EP.
EXP3: Damage Ring(837 EP) upgrade to Almighty Ring(3377 EP)
Charge will be 3377-837=2540 EP.
2,Change between same EP items
Charge will be 30% of the purchase price.
EXP1: Precious Fog Wing (White)(998 EP) change to Precious Fog Wing (Blue)(998 EP)
Charge will be 998*30%=300 EP.
EXP2: Godzilla Sword (Dex)(Freeze)(4000 EP) change to Anomalies Fist (Dex)(Freeze)(4000 EP)
Charge will be 4000*30%=1200 EP.
EXP3: Fire Mask(260 EP) change to Iori Yagami Mask(260 EP)
Charge will be 260*30%=78 EP.