first, install macchanger
http://maemo-hackers.org/apt/pool/ma....0-1_armel.deb
(you have to do it as root, using console)

then, as root, edit /etc/init.d/rcS:

#vi /etc/init.d/rcS

and add the code

ifconfig wlan0 down hw ether xx:xx:xx:xx:xx:xx
ifconfig wlan0 up

just before the last line:

exit 0

now, every time you want to renew you license, do this:

1. open console
2. $ rm -Rf /home/user/.navicore
3. Go to Offline mode
4. sudo gainroot
5. # macchanger -r wlan0
6. #vi /etc/init.d/rcS and replace the xx:xx:xx:xx:xx:xx with the mac address you got on step 5.
7. go Online mode
8. reboot
9. open Wayfinder and ask for new 7 day license.

wifi works & you can reboot w/o losing the new trial



(thanks to directore and to behindmaemolines blog owner)