[Q] 4.3 to 4.1.2 - Galaxy S III Q&A, Help & Troubleshooting

Stock UK BTU Rom Only no leaked ones or custom Roms
Ok Guys I no there is alot on here at the moment on how to Roll Back to 4.1.2 but that seems to be custom roms (pleas point me in the right direction if wroung)
Now I no a Single file Flash will not work so it needs to be a three file
But Here in the UK as you may or may not no 4.3 was rolled out and well its a mess so we need to help people roll back to stock BTU
Battery drain connection issues and others are the main problems
so we need a way to Help UK BTU users a way Back that works and does not brick there phones
I no the custom Guys Have managed this but that involves rooting and saving the EFS fold
that is all to complicated to get a Normal user to do
I no back in the days of Flashing we used three files and a pit file and re partition the phone
Back in the day we had to do this on the Galaxy S so no worries
we just need to know How and has it worked
So can you Guys Help Here ??????

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Northern.dj said:
Stock UK BTU Rom Only no leaked ones or custom Roms
Ok Guys I no there is alot on here at the moment on how to Roll Back to 4.1.2 but that seems to be custom roms (pleas point me in the right direction if wroung)
Now I no a Single file Flash will not work so it needs to be a three file
But Here in the UK as you may or may not no 4.3 was rolled out and well its a mess so we need to help people roll back to stock BTU
Battery drain connection issues and others are the main problems
so we need a way to Help UK BTU users a way Back that works and does not brick there phones
I no the custom Guys Have managed this but that involves rooting and saving the EFS fold
that is all to complicated to get a Normal user to do
I no back in the days of Flashing we used three files and a pit file and re partition the phone
Back in the day we had to do this on the Galaxy S so no worries
we just need to know How and has it worked
So can you Guys Help Here ??????
Click to expand...
Click to collapse
http://www.sammobile.com/firmwares/2/?page=3&download=21565
flash this using odin on your pc

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tomosh22 said:
http://www.sammobile.com/firmwares/2/?page=3&download=21565
flash this using odin on your pc
Click to expand...
Click to collapse
why would he do that?
he wants to go back to 4.1.2 and u give him a link for 4.3

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Raulinho7 said:
why would he do that?
he wants to go back to 4.1.2 and u give him a link for 4.3
Click to expand...
Click to collapse
I agree I don't want 4.3 as its a mess the clue is in the tittle !!!!
Firmware on sammobile Good as it is are single file and its well documented that as this has a partition change to go back you need to do a re partition that can not be done with a single file flash

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Northern.dj said:
I agree I don't want 4.3 as its a mess the clue is in the tittle !!!!
Firmware on sammobile Good as it is are single file and its well documented that as this has a partition change to go back you need to do a re partition that can not be done with a single file flash
Click to expand...
Click to collapse
Here is my exp....from 4.3 to 4.1 BTU
i did a manual flash of 4.3 from odin as my s3 is branded and i wanted the 4.3 update ..but then due to all the issue i wanted to go back to 4.1.2 BTU..
so i downloaded the MG4 BTU from sammobile and flashed it using ODIN on top of the 4.3, this of course landed me in a boot loop. I had not backed up my phone so i then re-flashed 4.3 back and that worked fine, i didnt lose any apps etc. So did my back up and the did a full wipe via the custom recovery and flashed MG4 this worked ok....
I dont know why i was in a bootloop after going back to MG4, i guess it was because i needed to wipe data etc before flashing the file?
Anyway this processed worked me...
ive been only flashing Stock rooms from day one...all of them being BTU as my phone is tmob branded and they dont seem to release any updates.

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Basic Faqs and Guides its all posted .
If you want to roll back stock but do not want to backup your EFS folder then its your risk .Likewise if you fail to understand EFSv2 etc .
Anyone looking to repartition or mess with PIT on a I9300 is asking for a brick .

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JJEgan said:
Basic Faqs and Guides its all posted .
If you want to roll back stock but do not want to backup your EFS folder then its your risk .Likewise if you fail to understand EFSv2 etc .
Anyone looking to repartition or mess with PIT on a I9300 is asking for a brick .
Click to expand...
Click to collapse
Like I said in the original post No firmware from Sammobile will work as the Bootloader has changed hence the boot loop
Samsung has pulled this with no Fix for the users that now have this
They need a way back to 4.1.2 with out rooting involved

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Northern.dj said:
Like I said in the original post No firmware from Sammobile will work as the Bootloader has changed hence the boot loop
Samsung has pulled this with no Fix for the users that now have this
They need a way back to 4.1.2 with out rooting involved
Click to expand...
Click to collapse
Contact Samsung .

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JJEgan said:
Contact Samsung .
Click to expand...
Click to collapse
:silly: I would of thought XDA would of taken this challenge on i hope some one can come up with a fIx for this
or has XDA given up on doing this

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Raulinho7 said:
why would he do that?
he wants to go back to 4.1.2 and u give him a link for 4.3
Click to expand...
Click to collapse
no thats a 4.1.2 rom, i have it as my secondary rom and in settings\about device\ it syas Android Version: 4.1.2
---------- Post added at 10:21 PM ---------- Previous post was at 10:16 PM ----------
No thats a 4.1.2 rom, i have it as my secondary rom and in settings\about device\ it syas Android Version: 4.1.2
EDIT: Hmm, i checked the download page again and it turns out you were right and it does say 4.3. Maybe because of were i live the phone reverted back or something. Sorry for the inconvenience.

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Northern.dj said:
Stock UK BTU Rom Only no leaked ones or custom Roms
Ok Guys I no there is alot on here at the moment on how to Roll Back to 4.1.2 but that seems to be custom roms (pleas point me in the right direction if wroung)
Now I no a Single file Flash will not work so it needs to be a three file
But Here in the UK as you may or may not no 4.3 was rolled out and well its a mess so we need to help people roll back to stock BTU
Battery drain connection issues and others are the main problems
so we need a way to Help UK BTU users a way Back that works and does not brick there phones
I no the custom Guys Have managed this but that involves rooting and saving the EFS fold
that is all to complicated to get a Normal user to do
I no back in the days of Flashing we used three files and a pit file and re partition the phone
Back in the day we had to do this on the Galaxy S so no worries
we just need to know How and has it worked
So can you Guys Help Here ??????
Click to expand...
Click to collapse
Man, I am now consider myself a victim to Samsung's trick- JB 4.3 leaked vodafone test files [no matter whether it xxxx.vdi/vdf/btu [thanks to faryaab] they all have same thing- change log/apps etc. too... I tested first two releases on top of my xxemh4. Both turned out during first boot "Deustchland" as primary language and felt something wrong on contrary Ireland/swisscom tags...However I kept on trying and voila...i found both as emulated version. However, i liked battety backup[w.r.t. me], camera, connecting to pc with previews of images and some other features. Then I saw this samsung's latest 4.3 Chinese version with different changelog. I tried flashing it but failed. Then I thought it might be a problem of that emulated ireland/swisscom version of 4.3. Just thought, back to original 4.1.2 may get me flashed this this Chinese 4.3. So thus did data flash/factory reset/ cache wipe etc from stock recovery mode and flashed this 4.1.2... it worked fine[downgrade method]. Then tried to get installed the Chinese 4.3. But failed still. Now, suddenly today I found that my s3 i9300 suffering from two problems with this stable rom 4.1.2 xxemh4 [upgraded through kies from previous another version of 4.1.2 which was kept on my pc for any eventuality]:
1. Bluetooth button does not get turned on
2. Phone shuts down when idle
My next method is to flash with pit, bootloader etc as given inhttp://forum.xda-developers.com/showthread.php?t=2535367
Lemme see whether it helps myself
IT DIDN'T HELP! Though my network is ok, and so thus wi-fi, I just checked *#1234* and says CSC: UNKNOWN!!!
I am now trying to patched CSC with this one from " this as suggested featherknox]