Which one is the Latest Os version of blackberry curve 8520?

[karanshah]

My blackberry curve 8520 is running very slow.
So I wanted to know about the latest OS version of it
My current OS is
Platform :5.2.0.113
App version : 5.0.0.1096 (1814)
If any Update,
Please let me know.

 

[Me]

http://forums.crackberry.com/blackberry-curve-85xx-f143/