On 19 August Nokia announced the latest operating system "Symbian Anna" for SymbianV3 devices AND you can download this update for your Nokia N8C7C6-01 and Nokia E7 phones.
This upgrade includes:
1-A new user interface
2-virtual QWERTY keypad
3-Split-screen messaging
4-Latest Nokia Maps
5-Fast web browsing
6-Better security
This Symbian Anna update can be downloaded through Ovi Suite on the PC or the SW Update app located on your phone.
The downloads is large, so it requires some time and i think the Ovi Suite method is best. You can also download it on your mobile but you should have a Wi-Fi connection for fast downloading.
Nokia, Symbian Anna