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It's not the (Checksum) number you need it's the 10 digit code. Second picture where it say serial 2691044652 that’s the number you need, obviously your SD card Serial number will be different
Also in some models you need to hold down the battery icon not the clock
Hope that helps
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10th February 2010, 07:26 PM #1Member
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16th April 2010, 09:15 PM #2Member +
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Weird, I only got a 6 digit code under serial, on a Nuvi 310
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