Is it possible to downgrade from jellybean back to ics

Alex Slane · Feb 7, 2013

Hi guys , need some information, I was just wondering is it possible that I could downgrade back to ics after putting jellybean on my phone?
Your help is appreciated.
All the best
Chris.
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dmbardal · Feb 7, 2013

Yes it is.
How did you upgrade?
If you upgraded via FlashTool you can just as easily downgrade using the same method, just by using an ICS .TFT instead of the JB one.

Any reason why you want to downgrade?
Make sure you do a complete wipe to make the ROM to be good and dandy, and the battery will get better after a few days.

dzadzev · Feb 7, 2013

Sure you can, you just need to flash ics ROM with flashtool (you dont need to have unlocked bootloader)

But I dont see the reason to downgrade

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Alex Slane · Feb 9, 2013

Thanks for the replies, I want to go back to ICS due to the major battery drain that I am getting, I have read a few threads now on here and also esato and jellybean battery seems to be very hit and miss.
I live how fast the phone has become but can't live with a poor battery. Got any ideas before I go back to ICS?

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gregbradley · Feb 9, 2013

Yes wait a few days, the first few days I'd flashing a Rom are always battery heavy

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Alex Slane · Feb 9, 2013

gregbradley said:
Yes wait a few days, the first few days I'd flashing a Rom are always battery heavy

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ok well , i have just read that formatting to extenal and internal memory helps , so i have just done that .
as you say its a big upgrade firmware wise so going to give it a couple of days and then look at what the diffrence is again .

Alex Slane · Feb 10, 2013

Ok so reporting back on my T's jellybean upgrade, seems that it's starting to level out a lot now, as I said in my last post did the memory thing and formatted both And the phone has responded very very well.
Seems to get a whole days usage now and maybe a bit more. I always charge anyways over night so nothing to worry about. How's yours?

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profchaos1981 · Feb 10, 2013

i had the same dilema as you to downgrade to 4.0.4...
I noticed today that the phone drains 4 to 8 % battery in standby mode over the night.. i havent noticed something like this in 4.0.4 .
I think the battery management was better.

Anyway i will follow your suggestion to wait a few days to level the situation .

I updated with mac bridge . What is the best method if i decide to downgrade ?
I need a clean install method .Format everything and clean install the rom i decide to install.

Also does the repair option in pc companion or bridge does a clean install;
Thank you

gregbradley · Feb 10, 2013

profchaos1981 said:
i had the same dilema as you to downgrade to 4.0.4...
I noticed today that the phone drains 4 to 8 % battery in standby mode over the night.. i havent noticed something like this in 4.0.4 .
I think the battery management was better.

Anyway i will follow your suggestion to wait a few days to level the situation .

I updated with mac bridge . What is the best method if i decide to downgrade ?
I need a clean install method .Format everything and clean install the rom i decide to install.

Flash a stock ICS ftf in flashtool

Also does the repair option in pc companion or bridge does a clean install;
Thank you

Yes.

profchaos1981 · Feb 10, 2013

thank you so much for your quick reply!

so if i got it right the repair option performs a clean install to the existing rom ..In my case it will reinstall JB 4.1.2

If i choose the flash tool i will choose the rom i want .. So do i get it right?
And if so where can i download the original 4.0.4 rom ? thank you again for your help!

gregbradley · Feb 10, 2013

profchaos1981 said:
thank you so much for your quick reply!
so if i got it right the repair option performs a clean install to the existing rom ..In my case it will reinstall JB 4.1.2

No, it will install the latest version for you phone/region. It may be ICS or it may be JB, depending if it has been released for you.

If i choose the flash tool i will choose the rom i want .. So do i get it right?

yes

And if so where can i download the original 4.0.4 rom ? thank you again for your help!

Look in the All in one thread. Its the first thread in the Q&A section and has all available ftf files in post 3.

Alex Slane · Feb 10, 2013

Yep use the original generic UK tft there on the forum mate there is a whole list of them, use flashtool and you'll have no problems.
In addition to that I downgraded my via flashtool and used pc companion to upgrade to jellybean if that helps also at the same time formatted the memory external and internal and once the upgrade was done wiped all data and set up, I've gone a full 20 Hours now and have 40% left which seems like it's done the trick.
Good luck mate.

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Alex Slane · Feb 10, 2013

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Alex Slane · Feb 10, 2013

Sorry a better screen for you.

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profchaos1981 · Feb 10, 2013

no luck with repair option.... It restores 4.1.2 and not the factory rom ..which in my case was 4.0.4 or 4.0.1..

So i will download the generic uk 4.0.4 rom and flash it with flash tool ..and thats it ? no other actions required ?

i chose this one [STOCK FIRMWARE] [ROM]LT30p Stock UK GENERIC 4.04 7.0.A.1.303 by batman_112
I also going to use flashtool 0.9.10.1 for mac.
Is it better if i use the official sony flash tool EMA ?

Torres77an · Feb 10, 2013

In my opinion the Jelly bean update is more of a downgrade then any thing it's very buggy and has a dated looking ui and the new features have been used before on other manufacturers phones like Motorola the lock screen is gay as **** and the camera is now a 12 megapixel instead of a 13 and the keyboard seems to be the same with no new JB features.

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Alex Slane · Feb 10, 2013

Yeah mate that's exactly it, using that firmware and flashtool you should have no problems at all.
I'm going to carry on playing with jellybean for a couple more days and then reevaluate which firmware I would prefer to be on.
Hope that all goes well for you anyways.

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Alex Slane · Feb 10, 2013

Torres77an said:
In my opinion the Jelly bean update is more of a downgrade then any thing it's very buggy and has a dated looking ui and the new features have been used before on other manufacturers phones like Motorola the lock screen is gay as **** and the camera is now a 12 megapixel instead of a 13 and the keyboard seems to be the same with no new JB features.

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I know exactly what you mean mate.
Going to see how jb fairs and then maybe revert back to ICS.

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Alex Slane · Feb 11, 2013

Ok so where In to 28 Hours in and this what I got! Very impressed now.

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gregbradley · Feb 11, 2013

profchaos1981 said:
no luck with repair option.... It restores 4.1.2 and not the factory rom ..which in my case was 4.0.4 or 4.0.1..

So i will download the generic uk 4.0.4 rom and flash it with flash tool ..and thats it ? no other actions required ?

i chose this one [STOCK FIRMWARE] [ROM]LT30p Stock UK GENERIC 4.04 7.0.A.1.303 by batman_112
I also going to use flashtool 0.9.10.1 for mac.
Is it better if i use the official sony flash tool EMA ?

If pccompanion restores 4.1.2 that is now the factory Rom. It's the latest official Rom for your phone provided by Sony.
If you really want the Rom you had before the official upgrade you have now, then use any file explorer and open the build.prop file that is found in the system folder.
Find the line that starts ro.version.customisation. And then had 8 numbers after it, tell me what those numbers are and I can point you in the right direction

Anyway, you can't use Emma to flash that, you must use flash tool

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Is it possible to downgrade from jellybean back to ics

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