[Q]How to downgrade from 2.2 froyo to 2.1 eclair

[shad0wboss]

If i use jboogie's clockwork recovery on my untouched 2.1 eclair, would it be possible to recover back to 2.1 from 2.2 just using the clockworkmod? I mean, not even thinking about flashing a rom but just recovering one rom to another and vice versa?

 

[xdaid]

As far as i know you can't go back to 2.1 just restoring a nandroid backup with clockwork recovery.
Consider if you want to upgrade to 2.2, you have to FLASH China froyo 0.26 or flash part of other 2.2 SBF (take a look at the jboogie3 and fritolays instructions to install their roms), no way to upgrade simply using CwM and nandroid backups thus no way to downgrade to 2.1 w/o falshing.

 

[shad0wboss]

yes but the problem is that i can't downgrade to 2.1...last time i needed to send my defy to motorola and i really needed to downgrade to 2.1 but the phone went dead and i couldn't do anything...so how can i downgrade from 2.2 to 2.1?

 

[shad0wboss]

I need help please...

 

[measel]

Well, in my understandig, if you followed the instructions exactly... then you should be able to downgrade by restoring your 2.1 nandroid backup directly followed by flashing the 2.1bootonly. Or you just flash the original 2.1 (not sure).

Unfortunately your bootloader will stay the one from Froyo and that will be detectable.

I always had downgradebility in mind when flashing new ROM's because I feared I couldn't get replacement and with this instruction from Higgsy:
http://forum.xda-developers.com/showthread.php?t=934366
I thought I was on the save side. Now my phone is broken and I found out that all the precausions were useless. :|

But hardware SHOULD work with this process.

 

[xdaid]

oh wait, maybe i misunderstood, are you on jboogie3? did you followed his direction (china-nandroid-bootloader)?
If yes, just falsh back to 2.1. I did it and i had no troubles.

 

[shad0wboss]

oh wait, maybe i misunderstood, are you on jboogie3? did you followed his direction (china-nandroid-bootloader)?
If yes, just falsh back to 2.1. I did it and i had no troubles.

basically, i don't have my phone atm...it's at motorola, soon recieving it back. What i did was that from jboogie's rom i just flashed 2.1 and it didn't work, the whole phone went dead...

but if you know how i can switch back to 2.1 please do tell me so that i can flash 2.2 again once i get my phone back !

 

[jboogie3]

basically, i don't have my phone atm...it's at motorola, soon recieving it back. What i did was that from jboogie's rom i just flashed 2.1 and it didn't work, the whole phone went dead...

but if you know how i can switch back to 2.1 please do tell me so that i can flash 2.2 again once i get my phone back !

dont flash that sbf. phone didnt die, it goes into a black screen because you have a non downgradeable firmware. You need to flash a different sbf.

 

[shad0wboss]

dont flash that sbf. phone didnt die, it goes into a black screen because you have a non downgradeable firmware. You need to flash a different sbf.

First thing i do when i get my phone back is to flash your honey rom but problem is, i want to be on the safeside so whatever happens i can send it back to motorola with no worries. Can you tell me some 2.2 sbf versions which can be downgraded to 2.1? Please tell me in detail.

 

[jboogie3]

First thing i do when i get my phone back is to flash your honey rom but problem is, i want to be on the safeside so whatever happens i can send it back to motorola with no worries. Can you tell me some 2.2 sbf versions which can be downgraded to 2.1? Please tell me in detail.

what u can do is make a nandroid back up once you get your phone back. so that when you want to go back to 2.1, flash the latest uk 2.1 sbf then nandroid restore the backup.

 

[shad0wboss]

what u can do is make a nandroid back up once you get your phone back. so that when you want to go back to 2.1, flash the latest uk 2.1 sbf then nandroid restore the backup.

But i read somewhere that 3.4 is not downgradable, so is there a special version of 2.2 on which i can flash 2.1 rom? because when i flashed 2.1 on 3.4 version of 2.2, the screen went black...also tell me if i need to flash some sort of bootloader too?

 

[ankit360]

if you have nandroid backup of original rom then yes it is possible .

 

[lcesser]

Phone don´t even turn on

Friends, i think did a bullshit. See my drama:

1) Install the normal sbf JRDNEM_U3_3.4.2_155-002_DEBLUR_SIGN

2) Install the nandroid 3.4.2_155-Nand.CEE_DEBLUR

3) Install the fixed sbf 3.4.2_155-Fixed.CEE_DEBLUR

4) To revert to Eclair, install the original uk sbf 2.21

4) And then, the result: the phone don't turn on.

Already pullout the battery and the sim chip, and nothing happens. I connect to pc, and the led goes white, but nothing happens. I try to go into bootloader, but the phone don't even turn on.

Please, i'm desperate here. Already searched and keep reading, but find nothing that helps me in this case.

I'm waiting for someone who can maybe give me a hint, or trashed everything and must take to service.

 

[ofmb]

Friends, i think did a bullshit. See my drama:

1) Install the normal sbf JRDNEM_U3_3.4.2_155-002_DEBLUR_SIGN

2) Install the nandroid 3.4.2_155-Nand.CEE_DEBLUR

3) Install the fixed sbf 3.4.2_155-Fixed.CEE_DEBLUR

4) To revert to Eclair, install the original uk sbf 2.21

4) And then, the result: the phone don't turn on.

Already pullout the battery and the sim chip, and nothing happens. I connect to pc, and the led goes white, but nothing happens. I try to go into bootloader, but the phone don't even turn on.

Please, i'm desperate here. Already searched and keep reading, but find nothing that helps me in this case.

I'm waiting for someone who can maybe give me a hint, or trashed everything and must take to service.

are you sure battery is charged?

 

[lcesser]

are you sure battery is charged?

Yes, ofmb, about 80% before the last flash. I don't know what happened, but i'm very frustated.

 

[dirtbaghh]

i think you should have skipped number 1, i think that's where you missed up,


this thread is half a month old but who knows, hehe