Here's a few more tips! (I've always done this and had no problems - ever!)

- Use a "cheap" CD-R disc (no-names are great!)
- Burn with 1x writespeed
- Let it validate the burn operation
- Turn key to 1 and insert the created OS-disc
- If nothing happens after a few seconds, go into the GPS option
- Let it upgrade - screen may blank - it could also take a few minutes before it responds!
- Take out the OS-disc when told so and press OK
- Take the car for a drive for atleast 5 minutes (helps the GPS settings to take effect!)

Good luck!