@rosanna
You are probably misunderstanding what Loly is saying. Don't use your unit with an sd card in it when you run MapUpdater. He is saying to make a 'fake unit' to fool MapUpdater (you can also do it with WebUpdater) to download ALL the files in one place onto a large enough USB stick, or a usb attached sd or microsd. You can then copy over whatever appropriate files which fit onto your unit's memory, and put the rest of the files onto an sd provided they are appropriate to go there (eg Maps & JCV etc).
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