SethP

I have an 08 E550 w/ P2... Meaning I have the HK Logic 7 sound system w/ navigation...

I know the 09 has superior software, and is far more than just updated maps (which I can get, and have in mine).

I'm assuming I can't just somehow update the software to the 09 spec and will have to exchange the head unit.

First, is this correct?

And if so, is this a reasonable DIY, assuming I can get my hands on a 09 HK Logic 7 GPS head unit?

Has anyone heard of or seen anyone else do this?

Diesel Benz

You cannot upgrade a 5 year old laptop to the performance level of current laptops by just updating the SW, this same applies between the two Comand units.

Installing a new unit isn't exactly straightforward because existing MOST fibre ring components would not be compatible with the new head unit, you would need a new amplifier too and the wiring to the head unit is very different from the old one.

Look at existing threads about NTG2.5 retrofit to get an idea, there are several discussions already about the topic.