Cable to update software

I am getting ready to update my autopilot with the r4 update how do I get the update from my computer to the raymarine system? Is there a cable to connect the computer to somewhere on the raymarine system or do I put the update on a Micro SD card and run it through the MFD?

12" hybrid touch
Ev200 pilot
Control head is either a 70 or 70r. It is the one with the turn nobb