I had the same problem trying to downgrade from version 4.30 to version 3.40; I downgraded to version 3.20 using instructions above and now my Nuvi 55 is working fine.
I had the same problem trying to downgrade from version 4.30 to version 3.40; I downgraded to version 3.20 using instructions above and now my Nuvi 55 is working fine.
2016.10 NT maps work?
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