Downgrading Froyo 2.2 to 2.1 Eclair

[creepinshadow]

You might think i'm crazy, but i'm dependent on CoPilot Live for Android, a navigation app, and it doesn't work in 2.2.

So is there a way to go down to 2.1 again? (preferrably without rooting)

would it be possible to just take a "update.zip" from 2.1 and follow the same steps like i recovered to 2.2?


any input is appreciated

 

[Rusty!]

You can only go backwards if you've unlocked the bootloader.

 

[Mi|enko]

Shouldn't he be able to use the signed release image in fastboot?

 

[Rusty!]

Nope, it wont let you go backwards.

 

[Scream1337s]

Are you sure that it doesn't work? What if you connect your phone and download the original rom and use Fastboot to flash this rom would you need an unlocked bootloader?

Greez

 

[Rusty!]

Need to be unlocked.

 

[ScaredyCat]

AFAIK using a PASSIMG should do the trick, you'll have to go through the upgrade process too to get to 2.1.

SC

 

[Rusty!]

You cannot go backwards with a stock bootloader, how many times do I have to say it?

 

[nexus5894]

You might think i'm crazy, but i'm dependent on CoPilot Live for Android, a navigation app, and it doesn't work in 2.2.

So is there a way to go down to 2.1 again? (preferrably without rooting)

would it be possible to just take a "update.zip" from 2.1 and follow the same steps like i recovered to 2.2?


any input is appreciated

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.

 

[Mi|enko]

AFAIK using a PASSIMG should do the trick, you'll have to go through the upgrade process too to get to 2.1.

SC

See. That's what I was thinking. I thought the signed image would just flash all contents, regardless of the version. . .that's how we gained root on G1s (flashed down to rc29). Pretty sure it related the radio too.

 

[pjcforpres]

See. That's what I was thinking. I thought the signed image would just flash all contents, regardless of the version. . .that's how we gained root on G1s (flashed down to rc29). Pretty sure it related the radio too.

We don't have an NBH file like the RC29 file was. Until you unlock the bootloader, you can only flash the phone using the stock recovery, and it has to be a signed update zip, and it won't let you go backwards.

 

[dsixda]

You might think i'm crazy, but i'm dependent on CoPilot Live for Android, a navigation app, and it doesn't work in 2.2.

So is there a way to go down to 2.1 again? (preferrably without rooting)

would it be possible to just take a "update.zip" from 2.1 and follow the same steps like i recovered to 2.2?


any input is appreciated

I have the same concern too with 2.2 and CoPilot. The CoPilot guys said they are currently working on a fix, so I would just wait a bit longer.

If you need GPS right away, then in the meantime just use the Google Maps Navigation or Brut.all's latest version of the hack that works for non-US and non-UK countries.. works fine in Canada for me.

 

[itslinx]

So there's no way to go back to 2.1 at all? Cause that's definitely something I want to do. My battery life (since having 2.2) is HORRENDOUS. Absolutely terrible. I can't deal with it right now.

 

[Rusty!]

You have to unlock the bootloader to go back.

 

[itslinx]

You have to unlock the bootloader to go back.

Any chance you can tell me how to do that? Does that involve rooting?

 

[Rusty!]

No, but it is a prerequisite of rooting.

There's a bunch of guides on here though, can explain it miles better than I could.

 

[spazoid]

Any chance you can tell me how to do that? Does that involve rooting?

Do a search there is a tut.

AND I AM BACKING HIM UP...FOR THE LAST TIME YOU HAVE TO UNLOCK THE BOOTLOADER TO REVERT BACK TO 2.1

 

[itslinx]

Thanks to both of you.

 

[lbcoder]

For everyone's information, the latest version of copilot also does not work with CM5.0.7 on Dream, however an older version, 8.0.0.606 *does work*. In case the same glitch is hitting them both, you might consider trying the older version with 2.2.

Also, please post the "logcat" for when it crashes.

 

[lbcoder]

Is there truly NOBODY interested in trying this?