4.1...4.2 is useless. Don't know about the downgrading part though...I've never done it.
What are currently the best ways to downgrade from 4.3?
Which version is better to have instead 4.2 or 4.1?
Thanks for the the tip on 4.1. Now all i need to know is how to get there
I just bought a Sundriver and it turns out that firmware v4.3 does not allow use of GameCube Menu. That makes use of Sundriver more complex than i had hoped it would be. If i knew this in advance i would probably go for Wode instead.
As this subject has been covered numerous times in our softmod guide (and as the OP has received said link), thread closed.