I'm from Serbia and the FM Transmitter on my N900 is also disabled.

I flashed it with everything I found here http://tablets-dev.nokia.com/nokia_N900.php, but none of it helped.

I thought maybe it's buried in some config file, but after flashing with emmc image, which should delete everything from the tablet it doesn't work either.
Maybe it's a hardware switch, which is turned on when they ship one to a country where it's not allowed to use it.

Did someone found a solution to this problem?