OS 5.0.0.900
Roger’s has officially released OS 5.0.0.900 for the BlackBerry Curve 8900, its not as new as the latest leak for the Curve 8900 which is OS 5.0.0.1036. If you want to load the latest official OS then grab it at the link below.
It is always recommended that you backup your phones data with the BlackBerry Desktop Software before installing a new operating system.