I follow ur instruction as per given above ,I selected all three main map file and extract it and one single file made (india_mi_201211.cpf size 553 mb), when I insert the sd card and give the path there after I open the navigation device mapmyindia page is open and read some file and after that system stuck on opening map...,and nothing happened ,plz give me advice to how to come out this problem ,plzzzzzzzzzzzzzzz

Thanks a lot to all , its working great, manojmat u r great,
Lots of thanks