Hi there.
I also dugUp my 770 device and reflashed the "SU-18_2008HACKER_4.2007.50-6_PR_F5_MR0_ARM" image.

Still the Wlan problem remains: I do not see ANY wlan networks. There are few N-wlans in the building.

has this been solved, ie how can I connect my Device to My wlan and use the browser?