Why any of you homebrew users would want to 'upgrade' is beyond me! You gain some crappy SD card thing and lose most of the functionality of homebrew? Thats a poor trade off.

Been lookin around and apparently if you have cIOS249 installed prior to upgrading you can still downgrade as it isn't touched, also you will lose any VC wads that have been installed if you visit the shop channel. You have been warned!