Some of Garmin’s GPS units (including members of the popular nuvi product family) are apparently locking up during the software upgrade process. Sounds like a bug in their bootstrap loader (a.k.a., bootloader) to me. A fix is now available. Full details at http://garmin.blogs.com/my_weblog/2009/06/ask-garmin-free-mandatory-gps-software-available-now.html
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