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If the unit indicates "software/firmware missing", then you can only try to re-install firmware by running WebUpdater again. If it doesn't work, then the unit has to be sent to service to have it re-flashed.
If you have a nuvi 350 download the software to your computer and then load the software onto a formatted sd card. Insert the sd card and bootup the Nuvi 350. The sofware will then load onto the Nuvi 350. If you have a Nuvi 200 I would think it works the same but I have not tried it.
Hope this helps