Thank you, guys, for the info provided. This sat nav has a row of connector to communicate with the car's entertainment system. It has 128MB RAM and I can see less than 32MB free, so I guess the kernel must have a bunch of Toyota specific driver that consume that amount of RAM. That may explain why I can't use GO navcore. So the question remains: Where can I find a better navcore for Toyota? (as suggested that 9.0xx is needed for current maps) Is patching the old 7.828 the only option I have?