if could go 34xx -> 35xx it should able to test with 35xx -> 34xx
To me it's hardware different then I assume can not.
Unlucky like delz and nuvi or the 13xx/14xx or 24x5/23x5
Be caution with these tests because real 3490-->37xx firmware = bricked nuvi (to trash) Kunix's experience
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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.