It's relatively easy to remove the Rt6 head unit and change the internal micro sd card from 4 to 8 or16Gig
The nerve-racking part is cloning the old card to the new.
I have seen instructions on how to do this on a french forum site (translated by google) because the translation may not be perfect I am wondering if anyone knows about this ?
Is it possible to install Igo8 on Rt6 unit ?