Just to expand on @osiris4isis reply, iGo maps work with iGo 8, Primo and NextGen. I would probably start by seeing how old your maps are (can check via the More->Help->About and then looking at the More->Content details).
If your maps are really old, then just find a download link for iGo maps for your contry and install them (replace the files in the "map" and "poi" directories).
If you want to update the actual software version (again, check that in the More->Help->About) and then look for a newer WinCE version (basically, WinCE Primo versions are 9.6.13 or earlier). I'd recommend version 9.6.13.405512 if sticking with Primo (which is my recommendation).
Here is a link for WinCE 9.6.13.405512 if needed:
[Only registered and activated users can see links. ]
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