Serafin, you're right: for the N800, Maemo wiki points to a non-existant www page.
Try here: http://www.nokia.it/supporto/support...mento-software
You won't have to push kbd buttons you don't have Of course I dob't know if reflashing will reset your lock code.
And if you still have problems, report here; I'll try to help (even if windows is not my environment of choice). You can use also
Italian if you wish so.