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[Q] Downgrading i9300 from 4.3 > 4.1.2

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danielkzlai
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(Last edited by danielkzlai; 9th February 2014 at 07:21 AM.)
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Info 2 [Q] Downgrading i9300 from 4.3 > 4.1.2

Hi guys. I just upgraded my GS3 from 4.1.2 to 4.3 and from the title, obviously I didn't like the upgrade .__.

Being a total noob and keeping my phone as simple as possible, I never rooted my phone. I did think of rooting it soon though (Just when the upgrade came. Sigh.)

After a bunch of problems: (can be omitted)
1) I couldn't use the GS3 Toolkit (from http://forum.xda-developers.com/show....php?t=1703488) cos my build was no longer 4.1.2. I do backups pretty often and I can't find any other backup programs that are easy to use.
2) Some of the widgets were gone.
3) Annoying settings ._.

I DID made a full backup. But it's not a NANDROID backup. Just a normal backup (.bak) file

I tried searching online to downgrade and there were a few questions I wanna make sure before diving into the downgrade process.

Q:
1) Especially when I don't have root, I saw some people saying their EFS being lost after downgrading http://forum.xda-developers.com/show....php?t=2640696 . I suppose have to root my 4.3 first then backup my EFS? After downgrading to 4.1.2, would my device still be rooted?

2) I shouldn't have to worry about my data being wiped because of the downgrade, right? Since I made a full backup for the 4.1.2, I can just restore my data back after I downgrade?

3) I see a lot of people talking about their phones BRICKING after downgrading few months ago. I suppose that's your phone breaking down. Would there any bricking problems if I follow this guide here? http://www.androidpit.com/how-to-downgrade-galaxy-s3

4) To be extra safe, I want to backup my apps (probably SMS, but not priority) again so I have 2 files just in case. I can't use Titanium cos I'm not rooted, any other suggestions? Or is it still recommended to root then backup then flash stock ROM?
 
Nasheich Xfiles
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darkmage93
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i have a i9300 with 4.3 that is sim locked on a carrier from my country. as far as i know, there are no free methods to unlock 4.3, but i read that 4.1.2 can be unlocked at home for free, or at least with galaxsim (it's not free but it's cheap ~ 3 euros). but i read that it isn't possible to downgrade to an older rom (the phone will brick/bootloop), is that true? i also saw that alot of people lost their imei. is it safe to try downgrading if i make a efs backup?
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Phone: SONY Xperia Z2
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JJEgan
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UNDERSTAND FIRST
http://forum.xda-developers.com/show....php?t=2362743

Network IMEI EFS
http://forum.xda-developers.com/show....php?t=2393289

Downgrade and network problems .

http://forum.xda-developers.com/show....php?t=2531221
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