I did one (feed) scanner in the radio, the other SDS 200 I took the SD Card out and put it in a USB adapter connected to the computer to update it. Scanner updated when I reinstalled the SD card in it and turned it on. I didn't want to drag the other scanner to the computer so I just took the card. You could do mobile mounted scanner this way.That's news to me, I've never been able to put a firmware update on a SD card that is removed from the radio and inserted in the computer. I've always needed the radio itself with the SD card in its socket.
Can anybody weigh in on this?