Cannot pair an speaker with the Bluetooth menu, can achieve the pairing via a terminal

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I've a Polaris V8 speaker,
When i try to pair it through the Bluetooth options, the phone finds the speaker but cannot pair with it.

I found that by using bluetoothctl, the Bluetooth connection is successful each time.

the steps :
$bluetoothctl
[bluetooth]# power on
Changing power on succeeded
[bluetooth]# discoverable on
Changing discoverable on succeeded
[bluetooth]# pairable on
Changing pairable on succeeded
[bluetooth]# agent NoInputNoOutput
Agent registered
[bluetooth]# default-agent
Default agent request successful
[bluetooth]# scan on
[bluetooth]# pair C9:50:76:XX
[bluetooth]# connect C9:50:76:XX

and then i select the device as trustable and no prob.

This problem affect my Nexus 4 rc-proposed and my laptop under 16.04

Regards