How to upload a TV firmware upgrade.

Question

I have a TV with a USB type 'B' female socket on it, labelled as 'software update terminal'. It's exactly the same connection as on the back of my printer. (Note this is NOT the USB socket type 'A' that is actually on a computer). So assuming that I could get an updated firmware file, how would I upload it to the TV ? A thumb-drive won't work, as they are USB type 'A'. I'm interested in the method - actually getting the firmware itself is a separate issue. Thanks !