i just bought nuvi 255W north america set ..from amazon..when try to install this malsingmap..the request for unlock code...i try to input the serial no of my nuvi to garmin singapore official site to get unlock code but they said invalid...

anybody can help me how to get unlock code for my nuvi 255W north america set ?...can i use garmin keygen v1.5 to generate it ?

thanks

halobaligps