Cheers for tht i now have navtweak opened and can load the file. If i have already got V29.1 on my MK4 can i install another V29.1 over the top with my new map colours, is it just as simple as swapping your navboot file with the new one i have just saved? And will the computer allow an upgrade because the OS iwill be insrtalling 29.1 is the same version i have on the computer.