Im such a numpty!
The reason I couldnt get the S.D. card to work in my car....was because I bought the wrong one! Doh!
My car has a Discover Pro , apparently they need different files/data or whatever!. I messaged the seller I bought it from today. Fair play to him, he asked me for a pic of my unit, I sent it to him, then he said it was the wrong card I bought! So he sent me over the files via e-mail, I deleted the POI on the SD card, then put the new file he sent me via e-mail onto the SD card...Bingo!
It updated nicely in seconds...job done!
If anybody else buys one of these cards, make sure you dont buy the wrong one..................Like this numpty did lol!