Sorry, I should have talked more details.
First, I replaced the files you mentioned about 00 folder in 2011; Then, replaced all IDX folders from 0A to 49 in 2011. I thought it will work as well as original 2010. But when I input the street name, the system always gives me a wrong name. Does yours work properly when you input a street name?
I have an 8GB SD card, so I make a backup of both 2010 and 2011. Right now I am using the 2010 only.