"Cannot locate NXT device to download firmware"

I am using a Bluetooth connection trying to update firmware from 1.05 to 1.31 and it displays the message:

Cannot locate NXT device to download firmware!

My NXT works fine other than that. I got it from a thrift store will so I don't know much about its history and I don't have a USB connector. I don't know what to do. What should I try next?

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