download Upoi Editor at [Only registered and activated users can see links. ]

( not the link but attached file), extract content and run UPOI Editor.exe

This is an old program designed at the time for primo, it is not certain that the compatibility of user.upoi data from nextgen is complete, you will have to keep a backup copy of your original file, only 11 fields out of 18 in total are editable with this program,

I think I remember that there was a more advanced version that had been made by the administrator of the DREAM-TEAM but the site having closed old members may still have it

when you open your user.upoi you will see if you find all of your saved contacts there, save it then inject it again into your nextgen to see if the number of contacts is maximum