LaFonera Software Upgrade-Flashing
From DD-WRT Wiki
Redboot Method
This is for versions earlier than 2007 - 0117.
DO NOT USE THIS METHOD FOR FLASHING FROM THE DEFAULT LaFonera FIRMWARE: Instead, use the method found here.
Either follow the Inital Flash routine for flashing via Redboot, or use SSH, telnet or serial console to the LaFonera and issue the commands below (this might also work if you do it under the Commands section on the webinterface).
cd /tmp wget <newest version of root.fs> wget <newest version of vmlinux.bin.l7> mtd write vmlinux.bin.l7 vmlinux.bin.l7 mtd write root.fs rootfs reboot