If im not mistaken Fl2 and D4 uses the same navi system, and to update the software for these vehicles you need to use the SDD. there is a funcion there to update both firmware and software map if availible by Jlr. There is a plug in the glove compartment that is firewire that they use to update the map on the Satnav HDD.
You can have a look @ freel2.com for more info about this, but many replaces the low line radio with aftermarket one, if you have the IHU (Integrated Head unit) (Hi-line audio)MOST bus then you can not replace it. Im not a freelander 2 owner my self, I drive a Disco3. but they have some gurus there that puts up howto's that i read with eager.
So have a look @ that site and see if you can get any more info about this.