Differences between OS .190 & .205 are minimal at best, with an improvement in OS stability, that's pretty much it.
As for the FM Tuner Radio feature you speak of, that is only availble to new BlackBerry Curve OS7 devices.
The Bold OS7 never had a FM radio feature.
An example would be NFC is only available for the Bold 9900&9930 and Curve 9360&9370 believe.
Not all devices will share all features across the board.