I am in Australia and am trying to access the new RDS-TMC service which BMW is not supporting at the moment as is unlikley to support for earlier build cars.

I have MK4 Navigation with a BM54 Tuner (new) which supports TMC and dynamic routing.

The RDS-TMC Service here is techically aligned with the UK i-TMC service however you have to pay for it, therefore it uses encryption and conditional access using Alert-C coding.

Does anybody know if I it is possible to update the nav os so it can decrypt incoming tmc messages?

Would I be able to add the appropriate access codes (that I would get from the TMC provider) to the os software using something like Navtweak or any other programs.

Or does anybody know someone that can help with this or point me to a website or forum that might cover this area?