Ok. Did you disconnect your nuvi from the PC after you flashed the cure fw? If so, remake the cure [if known, using the version of fw on the unit at the time of it freezing], reflash in preboot and leave the unit attached to the PC. It should enter mass storage mode and then be visible in WI. If still not visible, check in Windows Disk Management in case you need to assign a drive letter manually [Control Panel>Administrative Tools>Computer Management>Disk Management], and if it's showing w/o a drive letter do this: Right click it; select 'change drive letter and paths'; select 'Add' and assign a drive letter.
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