I have installed software version 7.16 RM-639. Can we install RM-775 which is available on Nokia X3-02.5. Is it available. Can we download nokia maps. Have they made it available for x3-02..
No you cannot install firmware from the other variant of the Nokia X3-02, it is technically not possible. The RM-775 variant had a 1GHz processor and double the RAM from memory, but this does not mean that it is made to run exactly the same firmware as its RM-639 brother which you have (running at 680MHz). Ask the same question at your local Nokia Care point and you will receive the same response. From what I can gather, and also other people have asked the same question in the past, but the X3-02 does not support Nokia Maps unfortunately.
Hope this helps.