[Nexus One General] guitar_east:
A little reminder guide for reverting back to stock

http://forum.androidcentral.com/google-nexus-one/43398-how-prep-nexus-one-gingerbread.html﻿

So you want to make sure you can get Gingerbread on your Nexus One, eh? There are a couple of things to consider:

1. Rooted versions will quickly follow any official (unrooted) update. So if you're rooted and don't mind waiting a little bit, you might just want to sit back and relax.

2. If you're running a stock (unrooted) Nexus One, you also can relax. You'll be able to manually apply the update once it's out.

3. If you're rooted and want to roll back to stock so that you can apply Gingerbread as soon as possible, read on -- THIS IS FOR YOU.

BEFORE YOU DO ANYTHING ELSE -- BACK UP YOUR ROOTED NEXUS ONE. This will wipe your phone back to the factory state!

1. Make a Nandroid backup of your current system. Do it from ROM Manager, do it from recovery -- either way, just do it. In fact, make two backups, just in case. You can always reload these Nandroid backups later if you want.

2. Back up your SD card. I just mount my phone and copy the entire thing to the computer.

Thanks to the collective genius that is XDA-Developers, rolling back to stock is pretty painless. They have directions in their wiki, but we're going to break them down into a few simple steps that work for both the T-Mobile and AT&T versions of the Nexus One. When you're all backed up and ready to go:

Step One

1. Download this file. It's the flashable, stand alone version of FRG33. You can't go straight back to FRG83 using this method. Just trust us.

2. Rename the file you just downloaded to PASSIMG.zip. Double check to be sure it's not PASSIMG.zip.zip, or PASSIMG.zip.jar. Windows will do that sometimes, and this only works if the file is named PASSIMG.zip

3. Place the PASSIMG.zip file on the root of your SD card. That means don't place it inside any folder, just mount your SD card and copy it over.

4. Power off your Nexus One, then hold volume down while pressing the power button.

5. Your phone will spend a minute or so looking for an update file (the PASSIMG.zip file). When it has the info it needs, it will ask if you would like to install it. Press the volume up key to choose to install the file.

6. Your Nexus One will take another few minutes installing the update, then it will reboot. Let it reboot the whole way, then go on to step two.

Step two

1. Delete the PASSIMG.zip file from your SD card. We don't want to try to update this file again.

2. Download this file direct from Google. It's the official signed update to FRG83, and will flash right over your current system.

3. Rename the file to update.zip. Again, double check that it's update.zip, not update.zip.zip or update.zip.jar.

4. The file you just renamed goes -- you guessed it -- on the root of your SD card.

5. Power your Nexus off, and hold volume down while pressing the power key to reboot.

6. Use the volume keys to navigate, choose the option that says recovery, and use the power button to select it. Your phone will soft reboot and you'll see a warning triangle with an adorable green robot.

7. Now hold the power button, and press volume up. You'll see a small menu in green text.

8. Choose "Apply SD card: update.zip" from that menu.

9. Sit back and watch your phone load and install the FRG83 update, including the radio and all the partitions. It will reboot more than once during this process, so don't be alarmed.

10. When your Nexus reboots back to the lockscreen, you're ready to go!

EDIT -- with the FRG83D update we now have a third step

After you have completed the steps above, you SHOULD be notified of an OTA update for your N1. If so, follow the prompts to install it. If not:

1. Download this file: http://android.clients.google.com/pa...3.ecb21b75.zip

2. As above, rename it update.zip

3. The file you just renamed goes on the root of your SD card.

4. Power your Nexus off, and hold volume down while pressing the power key to reboot.

5. Use the volume keys to navigate, choose the option that says recovery, and use the power button to select it. Your phone will soft reboot and you'll see a warning triangle with an adorable green robot.

6. Now hold the power button, and press volume up. You'll see a small menu in green text.

7. Choose "Apply SD card: update.zip" from that menu.

8. Sit back and watch your phone load and install the FRG83D update.

9. When your Nexus reboots back to the lockscreen, you're ready to go!