T420 Bluetooth connection without pairing

Hi all,
i am trying to connect to a bluetooth device that does not manage pairing numbers.
I can do that with other laptops, windows xp  and a bluetooth Digicom usb key,
but i can't with my T420, windows 7 and the Lenovo bluetooth.
When i add the device, i choose "connect without pairing" but when i try to connect to the serial port of the device, i receive the message "allow a device to connect" and i am required for the pairing code !!
Any suggestion?

The default pairing code will vary between products.
Common variants include 0000 and 1234.
It is best to consult the Bluetooth device's manual.
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X61T: L7500, 3GB RAM, 500GB HDD, XGA screen, Ultrabase
Y3P: 5Y70, 8GB RAM, 256GB SSD, QHD+ screen

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