Having same problem as above: flashed Opie 3.5.4 image, made loop file on SD card, upgraded loop, now card is "unsupported". Card is a Netgear MA701 Wireless CF Card. It still runs fine under the un-upgraded flash image. The LED on the card is on.
When working, this card shows up as an Ambicom WL1100C, and uses the Prism2 driver (hostap, right?), which doesn't show up in the list of bindings which the configure dialog presents. I didn't notice anything interesting in dmesg.
Would be helpful to have a list of the packages which are upgraded (maybe will do this tomorrow...er, today).
If anyone can shed some light on this, I'd appreciate it.