The official release of OS 5.0.509 for the BlackBerry Curve 8520 an 8900 and the BlackBerry Bold 9000 comes right after we leaked it so I doubt there are many differences if you have already upgraded. If not it seems like a pretty solid upgrade. Curve 8520 users will be glad to also get a nice new official update.
If you do not know how to upgrade your BlackBerry OS please start by reading this great step by step guide that Luis wrote up. NOTE: Don’t forget to delete the vendor.xml file located in c:program files>common files>research in motion>apploader to install it on a different carriers device.
Please confirm in the comments if this works for you!