tryn2bmee

how do I find the service combination?

Hi, I purchased this unit used without any wire harnesses or sd card.  After getting the rca and power harnesses, i finally hooked it up.  It powers on, but the screen goes blank.  So I figure I need the sd card with the firmware update, but I do not know which version is already on it.  So I started with the latest version 4.0, however at 43% It gives me the error code "Code 112 Copying error:|StorageCard|LPUE080|APL2|iGo|ScanSoft|RealSpeakSolo|SPEECH|components|vf_nanna_r40_83swf11_110_..." can't see the rest.  So I thought maybe i needed an older version to begin with.  So I reformatted the sd card and copied version 3.0, but once I turned on the ignition, I can see the initial screen but the update won't even start.  So, again, I reformatted the sd card and copied the 2.0, it will update only to 43% and gives me the same error code above.  I don't have the navigation wire hooked up yet, could that affect the installation?  I am grasping at straws trying to figure this out and I am beginning to think that I bought a bad unit.  Please give me any and all suggestions!  I am willing to try anything.  I have a road trip coming up this weekend and I really need this navigation to work.