Lowrance Iway 500c GPS Receiver "lms 334c igps" Questions

LMS-334c iGPS and have been unable to access the main menu screen. when I hit the menu key twice it does not display the main menu. more recently I have been unable to access the pages screen. Can the

...LMS-334 C iGPS. Where can i get a manual for it as i have no idea how to work it. Hi, you can find the manual here, ...