# 2.1 !!!gfps_handle_char_kbp: failed, result 3

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![](images/2.1+!!!gfps_handle_char_kbp_+failed,+result+3_a4f6aa83.jpg)

原因是 model id注册成功之后， google 会提供注册的model id以及对应的public key和 private key。

mcu cfg tool 输入的public key/private key不正确, 或者是输入的public key/ private key和model id 不匹配. 耳机端log就会提示   !!!gfps_handle_char_kbp: failed, result 3

请check 是不是 model id， public key,  private key 输入错误。

![](images/2.1+!!!gfps_handle_char_kbp_+failed,+result+3_6e4ebc40.jpg)