Official OS 6.0.0.448 for BlackBerry 9780 from Cosmote

Software For BlackBerry® Bold™ 9780 smartphone
BlackBerry Handheld Software v6.0.0.1879 (Multilanguage)
Package Version: 6.0.0.1879
Consisting of:

* Applications: 6.0.0.448
* Software Platform: 6.5.0.136
* File name: 9780M_PBr6.0.0_rel1879_PL6.5.0.136_A6.0.0.448_COSMOTE.exe
* File size: 172.96MB

Download from : blackberry.com

How to upgrade your BlackBerry® :
http://www.arthurtooy.com/2009/07/upgrade-os-blackberry/
Do upgrading with your own risks !