In your shoes, i would try RescueOS, http://devrandom.mooo.com/N900/rescueOS/ this will allow you to get into your N900 filesystem using pc + usb cable, irregardless of whatever else is installed or not installed on it.
flasher-3.5 -k 2.6.37 -n initrd.img -l -b"rootdelay root=/dev/ram0