Downgrading Froyo 2.2 to 2.1 Eclair

[maedox]

It was getting heated. They all went outside to fight.

 

[ihearttreo]

You can downgrade. Check here : http://forum.xda-developers.com/showthread.php?t=688562

I followed the complete instructions and i'm not rooted and I was able to revert back to 2.1.

Here's from the thread.

(1) go to androidtechnical.info
(2) click on "ANDROID ROM LIBRARY"
(3) type "Google OEM" into the search boy (of course without the "")
(4) click on "Search"
(5) click onto the "Google OEM" link that says "Nexus One Shipping ROM (Original)" in the "Version" column
(6) at the bottom you will find the download link
(7) happy downloading

(1) Do a Factory Reset via Android OS

(2) Reboot into Fastboot, go into Bootloader and click "Cleare Storage"

(3) Reboot your phone, plug it into USB and make Windows access it via USB

(4) delete all files on the SD-Card, format it, and then copy the PASSIMG.zip onto your SD-Card

(5) Shut down your phone and boot it into fastboot again and go into bootloader again. Now the phone will regonize and load your PASSIMG.zip and ask you if you want to update.

Everything that follows this instructions should be self-explaining (press yes to update etc.).

 

[Blueman101]

Can anyone confirm ihearttreo's previous response. I have read similar instructions on other forums so can anyone confirm?

 

[pjcforpres]

Can anyone confirm ihearttreo's previous response. I have read similar instructions on other forums so can anyone confirm?

I thought the bootloader checked for a .nbh file, not a .zip file, and that we didn't have the signed PASSIMG.nbh file for our phones.

 

[Blueman101]

also doesnt that mean that you had to unlock the boatloader thus voiding warranty?

 

[Rusty!]

Well a few people are confirming it. Google must have made some sort of allowance in FRF50 due to it being pre-release as it's never been possible to go backwards before. I tried to go from ERE36B to ERE27 and it was having none of it.

 

[ihearttreo]

Well, it worked for me. My Nexus is completely stock no modifications what so ever. If I knew this was such a big deal, I would have made a video.

 

[Blueman101]

but in order to go to the bootloader you have to unlock it right? thus voiding warranty right?

 

[ihearttreo]

No, you do not unlocking of the bootloader.

 

[Blueman101]

oh, so just booting into fastboot then to bootloader is not concidered unlocking the bootloader?

 

[Rusty!]

No it's not, unlocking the bootload is done via the command prompt.

 

[svet-am]

I can confirm that the steps in the first post worked for me to restore from FroYo back to Eclair.

Those of us familiar with this process automatically assume that the ZIP needs to be named "update.zip" and skip over the first couple of steps in the post.

Follow the post _exactly_ (including naming the update PASSIMG.zip) and it works like a charm.

 

[rjhay22]

I know many have posted saying there isn't a way to revert back to Eclair on an unrooted device... but here's a link that says otherwise, if you want to try it out.

http://forum.xda-developers.com/showpost.php?p=6618050&postcount=22

 

[peterocc]

I just did the entire process in less than 10 minutes and reverted my Nexus One (2.2 FroYo Leaked on Day 1) back to stock 2.1.

It sucks that I have to wait for the phone to receive the OTA for FroYo, but at least now it'll be legitimate.

 

[rjhay22]

Good guess it does work.

I just did the entire process in less than 10 minutes and reverted my Nexus One (2.2 FroYo Leaked on Day 1) back to stock 2.1.

It sucks that I have to wait for the phone to receive the OTA for FroYo, but at least now it'll be legitimate.

 

[RogerPodacter]

I just went from froyo back to cyanogen. Took about 10 min and was easy. Just placed the cyanogen zip and Google apps zip and old radio zip on my memory card. Boot into recovery, wipe, then flash from zip. Then restored a nand backup and up and running.

 

[deprecate]

I just went from froyo back to cyanogen. Took about 10 min and was easy. Just placed the cyanogen zip and Google apps zip and old radio zip on my memory card. Boot into recovery, wipe, then flash from zip. Then restored a nand backup and up and running.

they were talking about doing so without unlocking the bootloader.

 

[MadFlava]

Doesnt work for me. Gives me "Main Version Is Older" and fails.

 

[creepinshadow]

You can downgrade. Check here : http://forum.xda-developers.com/showthread.php?t=688562

I followed the complete instructions and i'm not rooted and I was able to revert back to 2.1.

Here's from the thread.

(1) go to androidtechnical.info
(2) click on "ANDROID ROM LIBRARY"
(3) type "Google OEM" into the search boy (of course without the "")
(4) click on "Search"
(5) click onto the "Google OEM" link that says "Nexus One Shipping ROM (Original)" in the "Version" column
(6) at the bottom you will find the download link
(7) happy downloading

(1) Do a Factory Reset via Android OS

(2) Reboot into Fastboot, go into Bootloader and click "Cleare Storage"

(3) Reboot your phone, plug it into USB and make Windows access it via USB

(4) delete all files on the SD-Card, format it, and then copy the PASSIMG.zip onto your SD-Card

(5) Shut down your phone and boot it into fastboot again and go into bootloader again. Now the phone will regonize and load your PASSIMG.zip and ask you if you want to update.

Everything that follows this instructions should be self-explaining (press yes to update etc.).

worked flawlessy for me , without unlocking the bootloader i went from manual 2.2 to 2.1, and then 2.1update1

 

[androidaddict23]

Does CoPilot not work at all, or is it just not available on the Market? If it's not available, you can find a phone that it works on and is rooted and do an "adb pull" of the application file, then place the file on your phone's SD card and install with a task manager.

it does not work because the market is not optimize for 2.2 because its not a release update