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[How to] Flash back to old bootloader after updated new bootloader XXELLA

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By Dr.Love, Senior Member on 5th January 2013, 03:30 PM
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Caution: I have tried this method with my S3 and successfully flash back to old bootloader XXALEF. But we always have to be careful when flash bootloader. According to sammobile, Samsung updated new bootloader to fix suddend death error of S3. Every update of the manufacture should be better. So I don't advise you to downgrade bootloader back to previous version. JUST ALWAY FLASH AS OUR OWN RISK !

And If you try and successfully please report here and let me know if it works 100% on another S3.

Hey guys,

After flashed stock XXELLA rom or flash new XXELLA bootloader. You can't not flash back to old previous version of bootloader anymore via PC Odin. And after every S3 reboot, it will show red exclamation mark at boot logo and always check flash counter =1 in download mode if you user custom kernel or custom CWM. This is 3 method to flash back to old bootloader:

>>> METHOD 1: You can use Sboot Checker to check which bootloader is backlisted. Then use some basic terminal commands to downgrade your bootloader. This is more simple and safer. Please visit @Odia's topic http://forum.xda-developers.com/show....php?t=2081748. Credit to him.

>>> METHOD 2: This is the most simple and fast method for lazy guys ! Just download the following .zip file and flash via CWM Recovery. You will be restored to old ICS bootloader XXBLFB. This is download link http://forum.xda-developers.com/show...&postcount=105. Credit to @fbatti73 he has ported @Odia's command to CWM flashable zip file. So many thanks to @fbatti73 and @Odia.

>>> METHOD 3: This is the first method I've found but far too much work involved and take alot of time. But if you like this' also another choosing:

1. Always backup first, full wipe yor S3 and flash back to lastest stock ICS 4.0.4 rom not included old bootloader in it or you can fash via Mobile Odin and don't care it include a bootloader or not because Mobile Odin doesn't flash bootloader. I''m in Vietnam and I choose this ICS 4.0.4 rom I9300XXBLH1_I9300OLBBLH1_XEV.zip http://www.hotfile.com/dl/166926386/...1_XEV.zip.html

2. After flashed ICS 4.04 rom don't root or do another work on it, Just check OTA update on S3 by Go to Settings > About device > Software update > Click Update. Let OTA update your S3 to JB 4.1.1. In my case the OTA will update to JB 4.1.1 XXDLJ1 and it takes about 2xx MB size. Yes, it's here. The processing of OTA update from ICS 4.0.4 to JB 4.1.1 can break the protect of new bootloader XXELLA . And after OTA updated to JB 4.1.1 you would have the old version of JB 4.1.1 bootloader. In my case it's bootloader XXDLJ1.

3. But although our S3 has old bootloader XXDLJ1 but it's still a JB bootloader version. Every S3 reboot you will still get red exclamation mark and counter =1 if you use custom kernel or custom CWM. To make red exlamation mark and counter =1 disappear totally. You only have to flash back to old ICS version bootloader XXALEF. And now you can flash back to XXALEF bootloader via PC Odin.

4. Just install a custom kernel and a custom CWM Recovery. Wa wa, red exclamation mark and counter =1 have already dissapeared totally.

This is the link of ICS old bootloader XXALEF can flash via Odin: http://www.mediafire.com/?dlruvz9fib6c046

>>> Many thanks to XDA members of the following threads. Yours'' replys helped me accidental found this way )

http://forum.xda-developers.com/show....php?t=2077844
http://forum.xda-developers.com/show....php?t=1918667
http://forum.xda-developers.com/show....php?t=1993044
http://forum.xda-developers.com/show....php?t=1646610
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5th January 2013, 03:48 PM |#2  
Quote:
Originally Posted by Dr.Love

Hey guys,

After flashed stock XXELLA rom or flash new XXELLA bootloader. You can't not flash back to old previous version of bootloader anymore. And after every S3 reboot, it will show red exlamation mark at boot logo and always check flash counter =1 in download mode if you user custom kernel or custom CWM. This is the way I found to flashed back to old bootloader.

1. Flash back to lastest stock ICS 4.0.4 rom not included old bootloader in it. I''m in Vietnam and I choose this rom I9300XXBLH1_I9300OLBBLH1_XEV.zip http://www.hotfile.com/dl/166926386/...1_XEV.zip.html

2. After flashed ICS 4.04 rom. You let OTA update check and let OTA update your S3 to JB 4.1.1. In my case the OTA will update to JB 4.1.1 XXDLJ1. Yes, it's here. The processing of OTA update from ICS 4.0.4 to JB 4.1.1 can break the protect of new bootloader XXELLA . And after OTA updated to JB 4.1.1 you would have the old version of JB 4.1.1 bootloader. In my case it''s bootloader XXDLJ1.

3. But although our S3 has old bootloader XXDLJ1 but it''s still a JB bootloader version. Every S3 reboot you will still get red exlamation mark and counter =1 if you use custom kernel or custom CWM.

4. To make red exlamation mark and counter =1 disappear totally. You only have to flash back to old ICS version bootloader XXALEF. And now you can flash back to XXALEF bootloader via Odin.

5. Just install a custom kernel and a custom CWM Recovery. Wa wa, red exlamation mark and counter =1 have already dissapered totally.

This is the link of ICS old bootloader XXALEF can flash via Odin: http://www.mediafire.com/?dlruvz9fib6c046

>>> Many thanks to XDA members of the following threads. Yours'' replys helped me accidental found this way )

http://forum.xda-developers.com/show....php?t=2077844
http://forum.xda-developers.com/show....php?t=1918667
http://forum.xda-developers.com/show....php?t=1993044
http://forum.xda-developers.com/show....php?t=1646610

Did you even tried it or you need other members to beta test it 4 u,post a video of u making this ACTUALLY work !
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5th January 2013, 03:50 PM |#3  
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Dr Love. In the OTA step- how much is the size of 4.1.1 ?
5th January 2013, 03:58 PM |#4  
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Pretty nice, will give it a try on the S3 of my mom
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5th January 2013, 04:23 PM |#5  
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Quote:
Originally Posted by nhariamine

Did you even tried it or you need other members to beta test it 4 u,post a video of u making this ACTUALLY work !

Oh, I have tried it with my S3 and successfully flash back to old bootloader. Sorry, I can't make a video. I will add caution in post 1 because always have to be carefully when flash bootloader. You can try as your own risk.

Quote:
Originally Posted by thekoRngear

Dr Love. In the OTA step- how much is the size of 4.1.1 ?

About 2xx MB.
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5th January 2013, 04:34 PM |#6  
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Quote:
Originally Posted by sangosnip69

Pretty nice, will give it a try on the S3 of my mom

5th January 2013, 04:38 PM |#7  
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I'm downloading everything I need, I'll get a try and come back later to tell you if it's work with French Firmware.
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5th January 2013, 07:43 PM |#8  
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Why there is red mark when phone boot? I'm running CM10.1 I got afraid because of that.

Sent from my GT-I9300 using xda app-developers app
5th January 2013, 07:43 PM |#9  
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how the new bootloader looks like ?
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5th January 2013, 08:30 PM |#10  
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Quote:
Originally Posted by eranda84

Why there is red mark when phone boot? I'm running CM10.1 I got afraid because of that.

Sent from my GT-I9300 using xda app-developers app

It appear because you use custom kernel or custom CWM with new bootloader.

Quote:
Originally Posted by F.M.K

how the new bootloader looks like ?

Go to google play, find app Android System Info. Install and run it you will see current version of your S3's bootloader in System Tab.
5th January 2013, 08:47 PM |#11  
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SUCCESS!!!!!!!!!!!!!!!!!!!!!!!!

Bootloader changed to XXDLJ1.

Update: Changed to ICS XXALEF.
Thanks a lot!!!

The trick is to download a full fledged ICS firmware of a country that yet no been updated to 4.1.2. After flash, let the OTA update according to that or any country that has not been updated to JB 4.1.2. I downloaded OP's Vietnamese firmware and flashed but chosen India on OTA update. It's a 285.07 MB file.
Voila you are done. The OTA does the trick.
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