Small note to others and for my future reference:
When running "opkg update" on the FLM, opkg attempts to download from:
"http://downloads.openwrt.org/backfire/10.03.1-rc5/atheros/packages/Packages.gz"
But errors on this with "wget: server returned error: HTTP/1.1 404 Not Found"
Solution: change line line src line in /etc/opkg.conf to
"src/gz packages http://downloads.openwrt.org/backfire/10.03.1/atheros/packages"
then run opkg update again.
The FLM02 firmware was pinned to rc5 at the time. OpenWRT have meanwhile removed the rc5 package repo. This has been fixed in commit 565f26 but the fix hasn't yet made it into an official release.
Be careful with the opkg update. It eats a lot of memory. It's better to directly install the package, e.g.:
Cheers
/Bart