Becker transit 45 map update

Hello everybody.

Sorry for my poor english .

I would like to update my Becker Transit 45 but i did not find any post with the search tool explainig how to do it.

Hence I decided to try with these new maps http://www.navitotal.com/maps-buildings-dem-poi-f82/europe-here-2015-t18034.html because they seem to have the same names as mine.

I copied one new map (only one country because I had not enough free space on my device) to my Becker (among the old ones) and tried to switch it on to see what happens but the chosen country had no road in it I had to restore it with the old map.

Can anybody tell me if updating it is possible (without giving more money to Becker) and be nice enough to explain how to do it?

Thank you for your time

You need a cured igo8.exe for Becker Transit 45 .