Hi I was wondering if anyone has been able to get either the 7340 or 7390 using an older firmware running in bridge mode successfully? Which firmware versions work?

I already have a Cisco router setup which I am using to learn CCNA etc so until I finish I would like to run a Frtizbox in bridge mode for VDSL.
I don't have a Fritz yet, so if one of them works I'll get it.