You shouldnt need a Brazil option. You should be able to select 'All Countries' / 'All Regions'. If that does find any channels, zip and attach your npvr.log so I can take a look.
There is no sign of any errors in those logs, but the device doesnt lock onto any signals. Those couple of frequencies you mention dont sound like typical DVB-T frequencies. You might need to try copy one of the files from 'c:\users\public\npvr\tuning\dvb-t', to make your own Brazil file, edited to specify a 'Brazil' country name, and the appropriate frequencies for your region.
If you do manage to create a file that works, post it and I'll include it for others.