I did a reset just after FW update.

Next thing I've tried, is to split CN Europe Unicode into many small files (1 file - 1 country), but nuvi displays only 2 of them in installed maps menu, and doesn't even show others (I think it shows the first two files from Map directory). An interesting fact that autorouting works between these files.
Any ideas why only 2 maps with same FID are shown? And what is the problem with 2.4Gb file of entire CN Europe Unicode.
I use 8Gb flash card to store imgs.