I don't think it is hardware problem, this device only doesn't boot after I made firmware update. probably because low battery power during update cause crash even I keep it connect to PC via attached USB cable (try to keep power). As Catymag said "Nuvi at restart loading updates need a charged battery, so never update with a poor battery"
Your Nuvi is sadly dead, no bootloader, may be someone here can try to find a way to revive it, but it's hard.
Stay tuned.
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Galaxy S5 Kitkat 4.4.2 / Nuvi1200->1250 / Nuvi3790T->34xx / Nuvi 2200 / Nuvi 66 / Oregon 600
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