First, you need to have TWO DBB-eligible units (Which units are DBB-eligible?) which are DBB-unlocked (How do I create a DBB-unlocked unit?)
View EITHER of the DBB-unlocked units and tap on its newly unlocked DBB SLOT. Select its partner.
Once bonded, their DBB slots will be filled with a "BB" icon of their partner.
How do I bond units?
gumi Support Team -
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