All at your further risk of course but i really doubt you can 'break' it further. Make sure the unit is fully OFF, not just in standby [you may have to hold the power button for up to 30 seconds]. Extract the RAR file to a CLEAN microSD and insert it in the nuvi then power it on. Make sure you have plenty of charge in the battery, if not power it on by connecting to a power source. Good luck.
Spoiler:
If the flash starts then 'Loader' or similar will appear on the screen. Don't interrupt it, it will boot when it's finished and hopefully it'll be back to normal. If it is, then immediately [Only registered and activated users can see links. ].
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