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System Software Missing on Nuvi 255w

While I was updating the GPS from Garmin Express, it said at one point that in order to finish the update you needed to restart your device. I did so, but on the next step it read that you had to restart it only when the updates were finished, which I did not do. When I turned on the device it read "SYSTEM SOFTWARE MISSING". I have tried all the steps, including pressing the power button for 60 seconds. The computer (iMac) will not recognize the device, so hence I cannot use the backup to revive it.
Note: Please use the simplest computer language, as I know nothing on computers nor GPSs.

Thank you in advance~
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