This unit is the RT4 and RT5 system and is made by Magneti Marelli
Main differences between RT4 & RT5 - RT5 has Bluetooth Hands Free, faster Navigation calculation and on C4 & C4 Picasso only, USB ports and a High-Res screen.
Try making a folder called "maps" on the SD card and put everything inside of this folder and try it again. I think I had to have two maps folders before it worked on my RNEG.
So you have MyWay then not RT6! That will explain it. I thought you were referring to the eMyWay. Do as Elis says, the content has to be right for it to be recognised.
Please note, I'm no longer active on the Forum, so won't respond to messages.