11-22-2012 03:44 PM
Welcome to BlackBerry Support Community Forums
Sorry you can't Update your BlackBerry Curve 8520 to OS 6 or OS 7 , because OS 5 is the limit for your device it can't handle higher OS version because lacks memory and hardware to handle those higher OS versions.
So I hope you Understands and believe me OS5 is the best OS for your BlackBerry Curve 8520.
Click " Like " if you want to Thank someone.
If Problem Resolves mark the post(s) as " Solution ", so that other can make use of it.