How to Manually Download and Install Android 2.3.3 Gingerbread on Nexus One

Step 1: Download the official Android 2.3.3 update for Nexus One from here.
Step 2: Rename this file to update.zip, and copy it over to the root of your SD card.
Step 3: Power off your phone, hold down the “trackball” button, followed by the “Power” button to turn it back on.
Step 4: Use the volume rocker buttons to navigate to BOOTLOADER->RECOVERY option and then select it using “Power” button.
Step 5: When you see an exclamation mark –like image on the screen, hold down the “Power” button followed by “Volume Up” button.
Step 6: At this stage you should be presented with Android’s Recovery menu. Now select “Apply sdcard:update.zip” option to apply the update from SD card.
Step 7: That’s it. Wait for the phone to complete the update process. Once its done, select “reboot system now” option to reboot your Nexus One into Android 2.3.3 Gingerbread.
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