updating to 4.0 isn't recommended at the moment because some homebrew apps won't work after the update...you could use Edited Out, which cuts out the homebrew limitations in 4.0, but this isn't save either.
what you could do is make a nand backup with bootmii and then update to 4.0.bootmii is compatible with any system menu, thats why you could "downgrade" any time using restoremii in bootmii.
Edited 1 time(s). Last edit at 06/01/2009 06:58PM by Arikado.