seeeduino bluetooth shield pairing code

Hello to everyone. I'm using a seeeduino bluetooth shield ( with my arduino to connect with a master bluetooth device wich has a predeterminated 128 bit pairing code. But after trying to connect and to input the pairing code from my arduino I realised that this shield use only 64 bit pairing code ??? Is this true or I'm wrong ? ( I tryed to connect from my cell phone and if I set a 128 bit pairing code it does not connect, with a 64 bit pairing code it does ) Is there anyway to change or update the shield's firmware? ( I founded no information about this on the seeeduino website.)

Thank you!