Just so I'm clear, no one has found a way to update the zx300 with a mac, have they? Media Go is only for Windows.. the only software Sony provides for a mac is Content Transfer which doesn't provide a function to update firmware. Oops, just found it. Here it is:
https://www.sony.co.uk/electronics/support/downloads/00014912
https://www.sony.co.uk/electronics/support/downloads/00014912
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