It seems we cannot use FON to run Nightwing anymore.
Because the article I read below at
http://stefans.datenbruch.de/lafonera/Note: As of 8th of november 2006, FON has fixed the bug in the web form, so the method presented here does not work anymore. Of course, there is a new method available to open your device. With firmware 0.7.1-2, this method has also been invalidated by FON. We have prepared a new method, this time called kolofonium, which is the most advanced method (and the easiest one for you) yet. Devices that did not come with firmware 0.7.1-2 can simply be reset back to their default firmware and opened with the earlier methods, however Foneras with 0.7.1-2 preinstalled are appearing now. Kolofonium also works with firmware versions up to 0.7.1-5.
So, La Fonera is out of the supported device, right?
Thanks
bingji