I tried this map (the unlocked img) in my LM55, where all others unlocked map didn't work, and it WORKS! Great news.
It seems that someone has found how to bypass the new locking mechanism.
Yeah! I tried the earlier version and it didn't work, not this one; thanks for the reply.
3490 ASR files
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Nuvi 3597; 3490; Etrex 30; Oregon 200 (from Approach S5)
Someone will release the Brazil file???