Imstruction:
1. Get image file, in Mode2/Form1 format
2. Burn image file using image burner eg www.imgburn.com
3. Insert OS CD into nav and follow on screen instructions

Note:
1. Battery in car must be good. If it goes flat during reflash you will destroy the nav
2. Make sure you make CD using Image Burning program. You cannot just copy the files to the CD, that doesn't work.