[Guide] From Root to Stock to "Test ROM" Froyo (25 Steps)

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Wisefire

Senior Member
Feb 8, 2009
507
265
Lubbock, TX
This is a very simple guide to install Android 2.2.

This will unroot your device, revert to stock, and update to FroYo.

Step 1. Download and unzip the original shipping Rom. (I unzipped it to the tools folder so I didn't have to type the full location in the cmd.exe)
http://rapidshare.com/files/3321487...ogle_WWE_1.01.1700.1_ERD79_release_signed.zip

Step 2. Plug in your Nexus One to your computer via USB.

Step 3. Open a Command Prompt on your computer

Step 4. Type adb reboot bootloader. This will boot into the bootloader.

Step 5. Confirm fastboot connection by typing fastboot devices.

Step 6. Erase your Userdata by typing fastboot erase userdata.

Step 7. Erase your Cache by typing fastboot erase cache.

(If step 6 and 7 do not work you can alternately do a factory data wipe within Android. Settings/Privacy/Factory Data Reset)

Step 8. Go to the directory where you stored your unzipped image file.

Step 9. Type fastboot flash userdata userdata.img

Step 10. Type fastboot flash boot boot.img

Step 11. Type fastboot flash system system.img

Step 12. Type fastboot flash recovery recovery.img

Step 14. Fastboot reboot

Step 15. Boot into Android > Settings > About > Update > Download and Install (This should be update-1)

Step 16. Download and copy the following zip to your SD card, and rename it update.zip
http://coblitz.codeen.org/www.romraid.com/paul/nexusone/signed-passion-ERE27-from-ERD79.a487b405.zip

Step 17. Reboot in to the recovery. Power+Trackball > Bootloader > Recovery

Step 18. Press Vol Up+Power

Step 19. Apply update.zip

Step 20. Finish and reboot.

Step 21. Copy the following to your SD card and name it update.zip
http://bit.ly/beSwQm

Step 22. Reboot in to the recovery. Power+Trackball > Bootloader > Recovery

Step 23. Press Vol Up+Power

Step 24. Apply update.zip

Step 25. Enjoy

----------------------------------------

Thanks to,
Football for the Original Shipping ROM link.
RomRAID for the ERE27 Link.
Gu1Dry for FroYo Link.
 
Last edited by a moderator:

frandavid100

Senior Member
Aug 5, 2009
490
14
Valencia
Step 4. Type adb reboot bootloader. This will boot into the bootloader.

Hi,

First off, thanks for the guide. Big help for us noobs around.

I'm stuck at step 4, though. When I try to ./adb reboot bootloader in Ubuntu 10.04, I get the following error:

error: insufficient permissions for device

I'm currently investigating the possible cause and solution, but any help would be appreciated.

EDIT: found the solution, I'll post it here in case it happens to anyone else:

./adb kill-server
sudo ./adb start-server
sudo ./adb reboot bootloader

Seems you have to kill the server and then restart it again with sudo.
 
Last edited:

Wisefire

Senior Member
Feb 8, 2009
507
265
Lubbock, TX
@FRIEDjellyWALNUT

Thats exactly what I came from.

So yes, I confirm it works.

@frandavid100

If you are in Win7 or Vista, right click cmd.exe and run as administrator.

Then try.
 

hondasr

Senior Member
Aug 1, 2009
205
27
Thanks very nice guide you are awsome. Thanks for your time.:D Froyo here we goooooo. Yesss Apple take this. FLASH ON ANDROID.:D:D:D
 

mrcheerio

New member
Jun 25, 2007
2
0
having trouble with this for some reason... i rename froyo to update.zip then i follow the instructions and i get an error when i select update.zip

grr it starts to update then it errors out. error in /sdacard/update.zip
(status 7)
installation abort ...
 

AbsoluteDesignz

Senior Member
Sep 16, 2007
1,595
51
New Jersey
if you're completely stock all you have to do is flash the update.zip


now can SOMEONE help me? I keep getting installation aborted no matter what...something about mp signature...can anyone help me out? PLEASE
 

Wisefire

Senior Member
Feb 8, 2009
507
265
Lubbock, TX
I'm on TMOUS, I don't see why it wouldn't work though.

@ AbsoluteDesignz
Hm, you have stock recovery? Also check to see if your running ERE27. (Android>Setting>About)
 

Wisefire

Senior Member
Feb 8, 2009
507
265
Lubbock, TX

Paul22000

Senior Member
Jan 19, 2008
3,522
155
Step 15. Boot into Android > Settings > About > Update > Download and Install

What is it downloading and installing in this step?

Step 16. Download and copy the following zip to your SD card, and rename it update.zip
http://coblitz.codeen.org/www.romraid.com/paul/nexusone/signed-passion-ERE27-from-ERD79.a487b405.zip


Is this necessary if we're already on ERE27? (On Desire r21)

ere272.png
 

mrcheerio

New member
Jun 25, 2007
2
0
i did :( and i got the same error again. also formated the sdcard again.


installing update...
assert failed file_getprop (shows a buncha of code)
e:error in /sdcard/update.zip
(status 7)
installation abort...


sob ...
 

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    Just to clarify, will this work on an unrooted epf30 to flash it to ere27?