I'm doing the update of this great firmware the difficult way. I want to update my opt directory, not to remove it. So I'm busy doing that and meanwhile I prepare sort of a howto for others.
Thank you Marc! I look forward to your how-to contributions.
- K.C.
P.S. I'm in the same boat you are. I have quite a substantial /opt on my own primary router that will be brought kicking and screaming to 1.0.7.8 soon.