Issues saving hex format data to binaryfield

I have a project where I am saving RFID information (which comes in as hex strings) to a bytea object in my postgres database. I can retrieve this information without issue. I am struggling to overwrite that object with new data (For when someone loses their rfid and needs to replace it). I have been unable to find an example of someone saving a small amount of data to a binaryfield. Just lots of people saying don't save images or files to binary fields and then explaining how to do that. 

Can anyone help me with simply saving something to a binaryfield to update a bytea object in a PostgreSQL database?

Thanks,
Brian

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