You Nuvi is HWID 827 really!
As Caty say hardware problem took place probably...
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.
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Nuvi1250/Nuvi 34xx/Nuvi 2200/Nuvi 66/Oregon 600/Galaxy S5 MM 6.0.1/TomTom GO/iGO Nextgen Avic,Basar,Isr.Gift/Navigon Please don't flood my pm box with questions you can post on forum!! You won't hear back from me.