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1. Obtain the replace from&#a hundred and sixty;right here (Google professional)&#a hundred and sixty;or&#one hundred sixty;here (mirror).
2. Rename the file to update.zip. Note that if you’re using Windows, just rename it to “update” (no quotes, of course) because it’s already a zipped file.
3. Copy the update.zip file onto your microSD card.
4. With your Nexus One off, hold down the trackball and press the power button.
5. You’ll be booted into a white screen with three Android robots on skateboards. Select “Bootloader.”
6. On the next screen, select “Recovery.”
7. Now Nexus One phone will reboot, giving you a picture of the Android robot and an exclamation point inside a triangle.
8. Now press the power button and volume up button at the same time. It could take a couple of tries.
9. Now using the trackball choose “Apply sdcard:update.zip” and let things run their course.
You may have to soft reset a couple of times after this and multitouch will be enabled, now sit back and relax and enjoy Nexus One with