For all of as y post that sd card working. Y have that mio C250 whit this sw and works very fine.
Instructions: copy the zip file, unzip whith 7Zip (sw free) put the unziped file into a SD card 2Gb or 4 Gb standard model: PLATINUM 4GB SD CARD.

ATENTION: MUST BE STANDARD NO HC-SD CARD.

Link to download: [Only registered and activated users can see links. ]

Put you navigation sw like tomtom, igo8, navigon etc and go.
If tomtom, must be activated first.
Klick om the icon mio navigation sw and whil see the new shell whith all new tabs etc etc.

Enjoy!