Just updated my maps via http://symbian.clanteam.com/indexmaps.htm .

Had to use the ones labeled "older maps for version 3.0 (also work with some newer versions (like 3.04), and with test version 3.0 beta)" since the "Maps for Ovi Maps 3.0" would crash for me.

Unfortunately, I wanted a map of Japan too, and the one from Ovi is just 3.5mb...