Earnest Byner says he's in favor of the Browns giving Kareem Hunt a second chance ... IF the ex-Chiefs superstar and the team can show he's a changed man.
TMZ Sports spoke with the ex-Brown shortly after Cleveland inked the troubled RB ... and he says BOTH Hunt and the team have to show more for him to accept the controversial signing.
Byner -- who trained with Hunt before the draft -- tells us he wants to see if Kareem has "gone through a process of development" before he throws his support behind the move.