The Nexus One is a smartphone from Google that uses the Android open source mobile operating system, As o February 2, 2010 announced an over-the air update for the Nexus One which will be rolled out to all users by the end of the week.It adds pinch-to-zoom functionality to the web browser, gallery, and maps applications. In addition it adds Google Goggles natively and fixes many of the 3G connectivity issues reported by T Mobile users.
These are simple, step by step procedure using which you can update your Nexus One software manually.
NOTE: The instructions below are only for the stock (unmodified bootloader, recovery etc) Nexus One. This procedure is NOT for rooted devices.
* Download the Nexus One Android 2.1 software update 1 (15MB in size) on your PC.
* Rename the downloaded .zip file to ‘update.zip‘.
* Connect and mount your Nexus One SD card on your computer using the USB cable.
* Now copy/paste the update.zip file to your SD card. Make sure the file is in the SD card root. It should not be in a directory.
* Then turn off your phone.
* Now to get in the bootloader mode, turn on the phone while pressing and holding the trackball and power button.
* Follow the navigation instructions on the screen. Select BOOTLOADER and then go to RECOVERY.
* When in recovery, you will see an Android bot with no text on the screen. Hold the power button and press the volume up key once. Recovery menu should be visible now.
* Using the trackball, select the second option “apply sdcard:update.zip“. The installation procedure should start now.
* After the installation completes, reboot the phone by selecting “reboot system now” from the recovery menu. It might look as if stuck again on the Android bot, but it will soon reboot.
Disclaimer: Try this on your own risk. We are not responsible if you mess up with your Nexus One.
That’s it! You have latest firmware now and Go to Settings >About phone to verify it