i have a broken n900 and the only thing i can get working is the update mode (display is broken and external monitor doesnt work as well) it was a waterdamage but as far as i can see, only the graphic chip is damaged (as the lock-key behavior still works with the led and background light going on and off depending on the lock status. also the led for loading works and when loading is completed, therefor, i guess that the system somehow still works. now i can get it into update mode via pressing "u". now, is there a way to make a "backup" via the update mode?

i have some basic linux knowledge (just for your information)