After purchasing a new and updated disk from Lexus you will need to get your tool kit from the trunk, open it and look for two long skinny metal studs. Use these to slip into the holes in the center of your radio console and pop out the cover to gain access to the DVD nav unit and replace the disk with the new one. Your nav manual should have all this info.
2008 Mercury Metallic IS-F, Takeda Intake System (154.1 Texas Mile Oct 2011)(13.13 @110 IFO Ennis TX)
2008 BMW 650I Convertible (wife's)