Download link to US Nokia site:
http://www.nokiausa.com/support/phon...61,770,00.html

Download link to European Nokia site:
http://europe.nokia.com/A4144790

Installer and image available at maemo.org:
http://maemo.org/downloads/nokia_770.php

Install new Windows wizard and download 2006 OS with it or download image from maemo.org and use Linux or Mac OS X flasher-2.0.

New version is 1.2006.26-8.

Edited to update information.