If you need the Desktop Manager and the HandHeld OS here is the link to download the Desktop Manager and the OS Version 4.0.0.319, just pick it from the drop down menu.
https://www.blackberry.com/SoftwareD...ient=biTZdMddN
Hope that helps some what. My old 6510 did that to me once, I reloaded the OS through the Desktop Manager and restored from a backup, and away I went.