update returns true , never update the db field

What is happaning ? I just update a record , without relations and it just doesnt update it but returns true ....

  $loadedModel = $this->model;
    $findModel = $loadedModel::findFirst($this->criteria);   //array("avatar_name = ' asdasdsa' " )

    if (empty($findModel) || !$findModel->update($data)) {     // $findModel->update($data)) is  true
        $this->results = new RepositoryMessages($loadedModel);
    }