For those of you impatient Nexus One owners who haven’t rooted your N1, here’s how to get your OTA update now.
Hi,
I have found out a way to update the Nexus One to the new OTA that Google is pushing through, the one including multi-touch everywhere.
Go to the URL below:
http://www.mediafire.com/?rgnjl4hqmmi
and download.Then save on to your sd card, not in any folders, and rename it update.zip (windows users just rename it update, .zip will come by itself)
1) Turn off your phone.
2) Turn on by holding down Power and the Trackball
3)Select Bootloader (Selection instructions on the top of screen)
4)Select recovery
5)An Android-Bot will come standing next to an open box
6)Press down Power and Volume Up
7)Select apply update.zip
8) Enjoy!All the credits go to Fabolous from AndroidForums.com
If you don’t want to download from mediafire, here’s an alternate link http://bit.ly/9vvioF
Source: http://forum.xda-developers.com/showthread.php?t=627533