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Bluetooth high security issue

My new SVP B606 smartphone uses Bluetooth 2.1. My 2007 Toyota Prius supports HFP (Hands Free Profile) Ver. 1.0 and OPP (Object Push Profile) Ver. 1.1. When I tried to register the SVP B606 to connect it to the Prius, the phone gave me this error message: "high security enabled--need 16 character key." The Prius only allows me to enter passkeys of 4-8 digits. Can you please help me resolve this issue? Thank you.
 

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