Clarion 505e unit

Hi all
Can anyone tell me if Clarion 505e runs WinCe as i have iGo primo on it with Mobile Map and want to change to IGO Nextgen tried loads of different versions but
soon as i put the SD card in get error message no SD card.

So anyone know what Clarion 505e runs on and if i can install IGO Nextgen on it. My SD card has a hidden Navigation menu which i cant access so i think the .exe file is there.

Any help appreciated.

Eggie